Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
Switching a boat, RV, or solar setup from heavy lead-acid to a modern lithium battery is one of the biggest upgrades you can make. The real question is which 12V 100Ah pack delivers the best blend of power, safety, and value for your build. This guide cuts through the specs to find the batterie lithium ion 12v 100ah that actually fits your build and your budget.
I’m Mohammad Maruf — the founder and writer behind KitchPrep. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
After digging through the data on eleven top contenders, the Litime 12V 100Ah stands out for its sheer longevity and sturdy 100A BMS, but the budget-friendly HumsiENK packs a punch with impressive app monitoring. Whether you are powering a trolling motor or an off-grid cabin, the right batterie lithium ion 12v 100ah is waiting below.
Our Picks at a Glance
How To Choose The Best Batterie Lithium Ion 12V 100Ah
Choosing a 12V 100Ah LiFePO4 battery means matching its BMS and cell quality to your specific power demands. Look past voltage and capacity to the BMS and cell grade that determine long-term safety and lifespan.
The Battery Management System (BMS) is Everything
The BMS is the electronic brain that prevents overcharging, over-discharging, and short circuits. It prevents overcharging, over-discharging, short circuits, and extreme temperatures by cutting off power when something goes wrong. A 100A BMS means the battery can safely deliver a continuous 100 amps (roughly 1280 watts of power) to your inverter, trolling motor, or fridge. If you need more, you will need to look at batteries with a higher BMS rating or run two in parallel.
Cell Chemistry and Quality: LiFePO4 vs. Standard Lithium Ion
All the batteries on this list use Lithium Iron Phosphate chemistry (LiFePO4). LiFePO4 is the safest lithium chemistry — it resists thermal runaway and lasts thousands of cycles. You want a battery that clearly states it uses “Grade A” cells. Cheaper “Grade B” cells degrade faster and will leave you with less usable capacity after a couple of years of regular use.
Physical Size and Group Number
Battery sizes follow a BCI standard. “Group 24” batteries have a smaller footprint ideal for fitting into tight marine compartments or RV trays, while “Group 31” batteries are larger and often pack a bit more material. A lithium battery at 100Ah is about one-third the weight of its lead-acid cousin, but the physical dimensions must match your tray. Always measure your battery compartment and compare it to the “Item Dimensions” in the specs before you click buy.
Low Temperature Charging Protection
If you plan to charge your battery in freezing weather, this feature is non-negotiable. A battery with low-temperature protection automatically stops charging when the internal temperature drops below about 32°F (0°C). Charging a LiFePO4 battery below freezing can cause permanent damage to the cells. The battery simply waits until the temperature rises, then resumes charging on its own.
Quick Comparison
| Model | Best For | BMS Rating | Weight | Bluetooth | Amazon |
|---|---|---|---|---|---|
| Litime 12V 100Ah★ Best Overall | Long-Term RV & Solar | 100A | 22.2 lbs | No (Bluetooth version available separately) | Amazon |
| HumsiENK 12V 100AhBest Value | Budget-Conscious Install | 100A | 19.73 lbs | Yes | Amazon |
| GrenerPower 12V 100AhSafety Pick | Safety-First Builds | 100A | 22.6 lbs | No | Amazon |
| DJLBERMPW 12V 100Ah | Golf Cart Conversions | 100A | 23 lbs | No | Amazon |
| DC House 12V 100Ah | Trolling Motors | 100A | 23.8 lbs | Yes | Amazon |
| CYCLENBATT 12V 100Ah Mini | Confined Spaces | 100A | 20.5 lbs | Yes | Amazon |
| ECO-WORTHY 12V 100Ah | Reliable Off-Grid Base | 100A | 23.2 lbs | Yes (Bluetooth 5.1) | Amazon |
| Power Queen 12V 100Ah | Marine & Heavy Fishing | 100A | 24.25 lbs | No | Amazon |
| Renogy 12V 100Ah Mini | Tight RV & Kayak Fit | 100A | 22.7 lbs | Optional (via shunt) | Amazon |
| Power Queen 12V 100Ah Bluetooth | Saltwater & App Control | 100A | 24 lbs | Yes | Amazon |
| LiTime 12V 100Ah Group 24 Bluetooth | App-Focused Upgrades | 100A | 21.9 lbs | Yes | Amazon |
In-Depth Reviews
1. Litime 12V 100Ah Lithium Battery
Our pick — over 4.5★ from 750+ verified ratings; the strongest balance of quality and price.
The crowd-favorite workhorse promises 15,000 cycles at a budget-friendly price.
Weight is the first thing you notice — at just 22.2 lbs, this Litime battery is roughly a third of the weight of a comparable lead-acid unit. That makes it a one-hand lift for installing in a travel trailer or moving into a solar shed. The case is a standard Group 31 size (13 x 6.77 x 8.5 inches), so it slides into existing battery trays without any bracket modification. What wins people over is the battery quality and life, earning the most praise by a wide margin — owners consistently report that these packs handle years of daily cycling in RVs and off-grid solar setups without fading.
The internal 100A BMS (battery management system) watches for overcharging, deep discharging, and short circuits, letting you draw a continuous 1280W without worrying about a shutdown. One owner reported running their RV air conditioner for several hours off a single charge, proof of the 1280Wh of stored energy. The trade-off is that this version lacks built-in Bluetooth monitoring; you will need to use a separate shunt or monitor to check the state of charge from your phone. The manufacturer backs it with a 5-year service support and AIG product liability insurance, which adds a layer of trust for a permanent install.
Why It Dominates
- Up to 15,000 deep cycles at 60% depth of discharge far outpaces most competitors
- Automotive-grade A+ cells deliver stable voltage and high power output
- Expandable to 20.48kWh (4P4S) for serious off-grid or home backup builds
The Catch
- No built-in Bluetooth monitoring — requires an external device for phone alerts
- BMS can enter protection mode after a deep discharge; needs a small load or charger to wake it up
Reach for this if: You want a proven, high-cycle-count battery for long-term RV living, solar storage, or a backup system that you can scale later.
Look elsewhere if: You need built-in phone monitoring or you are fitting into a tight Group 24 compartment — this is a larger Group 31 footprint.
2. HumsiENK 12V 100Ah LiFePO4 Battery
The sub-20-pound featherweight packs a 100A BMS and full Bluetooth app control.
At only 19.73 lbs, this HumsiENK battery is the lightest 100Ah pack on the list — a full 2.5 lbs lighter than the next competitor. That weight saving comes in a compact Group 24 size (8.4 x 6.6 x 10.2 inches), which fits standard battery boxes and leaves you room for a second battery in parallel.
The battery is IP67 waterproof and shock resistant, which means it can handle spray from a trolling motor splash or rain on a boat deck without issue. It claims a massive 15,000+ deep cycles and carries SDS/UN38.3/FCC/CE/ROHS certifications. Buyers report that the BMS and app connectivity are “flawless” and that the battery powers heavy loads like freezers through a 2000W inverter on a timer. The honest trade-off is that the BMS can shut down at around 10V under heavy draw, requiring a 12V jump to wake it. Treat it as a deep-cycle storage battery, not a starter battery, and you will get exceptional value.
The Lightweight Powerhouse: This is the best entry-level LiFePO4 battery for anyone who wants Bluetooth monitoring without paying a premium. It weighs 19.73 lbs, compared to the ECO-WORTHY at 23.15 lbs, while offering the same 100A BMS protection.
Best for: Budget-first buyers who still want to see cell data on their phone and need a battery that fits a standard Group 24 box.
Think twice if: You are using it for a high-surge application like a golf cart motor — the BMS wake-up procedure can be an annoyance.
3. GrenerPower 12V 100Ah LiFePO4 Battery
Cylindrical Grade A+ cells and a near-perfect rating make this the safe choice for confidence.
The use of cylindrical Grade A+ battery cells is the standout feature here — these are physically more sturdy against vibration and swelling than the common prismatic cells found in most other packs. The battery’s 5-layer protection covers overcharge, overdischarge, short-circuit, overcurrent, and overheat, and the manufacturer specifically markets it as having “no thermal runaway risk.” For anyone installing a battery inside a camper van or a boat hull where safety is the top concern, that engineering choice matters.
At 22.6 lbs and a Group 24 footprint (10.23 x 6.61 x 8.3 inches), it is a direct drop-in replacement for existing Group 27 or Group 31 trays. Owners mention it lasts “a long time” powering a 3hp electric motor on a dinghy, with no power drop-off after 20 minutes of heavy current draw against wind. The performance and battery quality lead the positive feedback. The limitation is that this battery is not designed for starting engines or golf carts — it is strictly a deep-cycle energy storage battery. It comes with a 5-year warranty and a 5-10 year technical after-sales service promise.
Cylindrical Advantage: The cylindrical cell design inherently handles physical stress better than flat prismatic packs, making this a top pick for rough-road RV travel or choppy marine conditions where vibration is constant.
Grab this if: Safety from physical damage and thermal risk are your primary worries, especially for a mobile install in an RV or a small boat.
Skip it for: Starting applications or golf cart use — the BMS is tuned for deep-cycle storage, not high-burst starting currents.
4. DJLBERMPW 12V 100Ah LiFePO4 Battery
The 23-pound lithium swap that turns a 330-lb lead-acid golf cart into a lightweight distance machine.
Owners consistently praise this battery for golf cart conversions. One report details swapping six heavy lead-acid batteries (330 lbs total) for three of these DJLBERMPW units (22 lbs each) in a 36V EZGO cart — driving 24.2 miles at 14mph with headlights on, dropping from 42V to 39.1V. The weight reduction alone transforms how the cart handles hills. The battery supports fast charging at up to 50A, and the maker claims you can top it off in about 5 hours with a dedicated 14.6V charger.
The upgraded 100A BMS includes low-temperature cut-off protection, which stops charging if the cell temperature drops below freezing — a vital feature for anyone storing a battery in an unheated garage or shed during winter. The case is IP66 waterproof, so splashes from a trolling motor or rain on a boat deck are not a concern. Customers note that the battery powers a MinnKota Ulterra 24V trolling motor successfully and consumes only 4 watts on idle, making it efficient for long fishing trips. The manufacturer includes a 5-year after-sales service warranty.
Lead-Acid Killer: The real-world golf cart test proves this battery can replace 110 lbs of lead-acid per unit and still deliver 24-mile range. It is also a good fit for a 30-70 lb trolling motor with its 100A continuous discharge rating.
Best for: Golf cart owners who want to shed hundreds of pounds, and boaters who need an IP66-rated battery for a trolling motor.
Not for: Installations where you absolutely need Bluetooth monitoring — this model does not include it.
5. DC HOUSE 12V 100Ah LiFePO4 Lithium Battery
A dedicated Bluetooth battery for the angler who needs to know their trolling motor’s exact state of charge mid-lake.
This battery is tuned for the trolling motor crowd. The DC HOUSE app (Bluetooth range of about 5-10 meters) gives you per-cell voltage readings, a fault display page to troubleshoot issues, and a clear state-of-charge (SOC) percentage. One owner reported trolling a heavy 16-foot aluminum boat with a Terrova motor for four straight hours on a windy day and still had 60% charge left. The battery life is the most praised feature, with 34 buyers specifically calling it out as a standout.
The low-temperature protection is thorough: the BMS cuts off charging below 19.4°F and stops discharging below -4°F, automatically resuming when the temperature climbs back to 32°F. The case is slightly taller than a standard Group 24 size — about 0.32 inches — so measure your compartment before buying. Weighing 23.8 lbs, it is still light enough to carry in one hand. The 3-year warranty is shorter than some competitors, but the Bluetooth accuracy and marine-use focus make it a solid pick for dedicated fishermen. An occasional unit shows a “bluetooth distance limited” complaint, but the connection is reliable within the rated range.
Real-World Trolling Test: 4 hours of heavy trolling in a 16-foot aluminum boat with 60% remaining is a concrete example of its usable capacity. The Bluetooth feature removes the guesswork of “is my battery dying?” during a fishing trip.
Choose this for: Frequent boat trolling where real-time battery monitoring on your phone directly affects your day.
Consider another if: You need a larger Group 31 footprint or want to build a large 48V series system — this only supports up to 4 series or 4 parallel, not 4P4S.
6. CYCLENBATT 12V 100Ah Mini LiFePO4 Lithium Battery
The tiny footprint that fits in spaces a standard Group 31 simply will not go.
The defining spec is the physical size: this battery is 45.83% smaller in volume than a standard Group 31 battery, measuring just 5.43 x 8.19 x 9.01 inches. That is small enough to wedge into the corner of a teardrop trailer battery compartment or slide under the deck of a kayak. Despite the mini size, it still delivers a full 1280Wh of stored energy and can push a peak surge of 350A for 1 second, which is more than enough to start many trolling motors or power a portable fridge. The handle on top makes it easy to carry at 20.5 lbs.
The BMS includes low-temperature charging protection that cuts off the charger below 32°F and automatically recovers when it warms up. The Bluetooth app lets you monitor voltage, current, cell balance, and temperature, and you can even turn the battery’s output on or off from your phone. One owner measured a delivered capacity of 105Ah — actually exceeding the rated 100Ah. The case is sturdy and compact enough that it fits in the same space as some 50Ah batteries, which is impressive. It is not designed for golf carts, but it works great for RV solar systems, trolling motors, and portable electronics setups.
Why It Works
- Smaller volume than Group 31, making it a true space-saving drop-in
- Measured capacity can exceed 100Ah (105Ah in one owner’s test)
- App provides per-cell voltage data and allows you to cut power remotely
Compromise
- Not recommended for golf carts — the 100A BMS may struggle with continuous high draw
- Size may be too small to fit securely in some standard battery trays designed for larger Group 31 boxes
Reach for this if: You have a tight installation space, or you are building a portable power station where every cubic inch counts.
skip it if: You need to replace a Group 31 battery in an existing tray that was designed for larger dimensions — you may need to add padding foam to secure it.
7. ECO-WORTHY 12V 100Ah LiFePO4 Lithium Battery
The UL-tested workhorse with Bluetooth 5.1 that holds its charge for weeks without a top-off.
ECO-WORTHY brings UL testing to the budget-friendly tier, which means the cells inside have passed independent safety testing for thermal and electrical abuse. The battery is a standard Group 24 size (10.23 x 6.6 x 8.23 inches) and weighs 23.15 lbs. The Bluetooth 5.1 app shows you voltage, current, remaining capacity, and an estimated working time — buyers specifically love seeing the “state of charge” readout on their phone during a fishing trip or an off-grid weekend. The battery also holds charge remarkably well in standby; reviewers point out it sits for weeks without noticeable voltage drop.
The low-temperature cut-off protection kicks in below 19.4°F ( -7°C) to prevent charging in freezing weather, a critical safety feature. The 100A BMS handles a 100A surge for starting pumps or a leaf shredder without tripping. You can build a 2S4P bank (up to 10.24kWh) for a larger solar system. The few consistent notes from buyers are that the Bluetooth, while useful, “should be an option” for those who do not need it, and the battery can take up to three weeks to ship. At this price point, it competes directly with the DC House and HumsiENK but carries the extra credibility of UL cell certification.
UL Confidence: The UL-tested cells set this battery apart from many similarly priced units that only carry CE or RoHS. For an off-grid cabin where battery safety is essential, that certification provides a real layer of trust.
Best for: Buyers who want a UL-tested battery with Bluetooth monitoring and a proven track record of staying charged during long storage periods.
Consider another if: You need a battery quickly — shipping times can be longer than Prime offerings from other brands.
8. Power Queen LiFePO4 Battery 12V 100Ah
A 24.25-lb Group 31 battery that kept an 18-hour fishing trip going without a noticeable voltage drop.
This Power Queen battery in the standard Group 31 footprint (13 x 6.77 x 8.5 inches) is a direct upgrade for bigger RVs and deep-V fishing boats. The real-world story that stands out is an owner who used it for 18 hours of fishing on a 17.5-foot boat in choppy water — the battery “hardly lost any juice” after that marathon session. That kind of endurance comes from the premium LiFePO4 cells and a smart BMS that includes 20+ protections. Weighing 24.25 lbs, it is slightly heavier than the competition, but that extra weight is partly due to the larger case size and sturdy internal cell packaging.
The battery supports up to 4,000 full cycles at 100% depth of discharge, and you can expand it to a 4P4S configuration for a 20.48kWh system. Buyers who use it in travel trailers appreciate that they get double the usable power (100Ah vs. 50Ah) compared to a lead-acid battery of the same advertised capacity. Power Queen offers a 5-year warranty. The one caveat we see is the 40 milliohm internal resistance, which is higher than some competitors — this generally means it is slightly less efficient at delivering very high surge currents, but for trolling motors, RV appliances, and solar storage, it performs beautifully.
18-Hour Stamina: The reported performance data — 18 hours of trolling with minimal capacity loss — is a strong indicator of its usable energy density. It also weighs nearly 10 kg, which is a manageable one-hand carry.
Choose this if: You want a proven Group 31 battery for long fishing days or heavy RV use, and you appreciate the 5-year warranty coverage.
pass on it if: You need built-in Bluetooth monitoring — this version is a straightforward battery without phone app connectivity.
9. Renogy 12V 100Ah LiFePO4 Mini Battery
Renogy’s mini battery is a Group 22NF size, fitting where others cannot.
The “Mini” designation is not marketing hype — this Renogy battery measures just 9.02 x 5.43 x 8.39 inches, which is a Group 22NF size. It is a compact size, ideal for tight installations. That makes it a perfect fit for a teardrop trailer, a kayak hatch, or a tight marine console where every inch of battery space is at a premium. Despite the small size, it weighs 22.7 lbs and uses UL-listed, EV-grade prismatic cells inside with metallic cell spacers to prevent damage from road vibration or choppy waves.
The 100A BMS protects against low-temperature charging, high temperature, overvoltage, undervoltage, overcurrent, and short circuits. The IP65-rated case resists splashes and dust. One owner paired it with a Renogy solar panel and a RenogyONE monitor and reports the system blocks overcharging and works flawlessly. The battery can be mounted in any orientation (except upside down) to fit into odd spaces. Remote monitoring requires a separately sold Renogy 300A Battery Shunt; this battery does not have built-in Bluetooth. The brand’s ecosystem is a strong draw if you already use Renogy solar controllers.
Size Champion: 50% smaller than Group 31 and 13% smaller than other mini brands — this is the smallest physical footprint for a 100Ah battery in this roundup. The IP65 casing adds marine-ready protection.
Grab this for: Ultra-tight installations in teardrop trailers, small boats, or kayaks where no standard battery fits.
Look elsewhere if: You want out-of-the-box Bluetooth — you will need to buy the Renogy shunt separately to get phone monitoring.
10. Power Queen 12V 100Ah Bluetooth Battery
An IP65-rated, salt-resistant battery with Bluetooth that a bass boat owner can check from the driver’s seat.
This is the Bluetooth-equipped version of the Power Queen Group 31 battery, and it adds some serious marine-specific upgrades. The case is IP65 waterproof and salt-resistant — built to handle the spray and corrosion of a saltwater fishing environment. The Bluetooth app lets you check the state of charge, run system diagnostics, and even turn the battery’s discharge on or off from your phone. One owner reports installing two of these in a bass boat and says they are “so much lighter, so much easier to install” than the old acid batteries, and the spouse loves checking the charge levels on the app. Another owner uses two in a 50 lbs trolling motor setup alongside a Yaesu ham radio and says the app is accurate and provides “status confidence.”
The battery delivers 1280Wh of energy and supports 4000+ deep cycles at 100% depth of discharge. The low-temperature protection stops charging below 32°F and stops discharging below -4°F. It can be expanded up to 4P4S for a 20.48kWh system. Owners note that when the battery ships, it arrives at a low state of charge (around 26%) and needs to be plugged in to a charger to “wake up” — that is normal and the BMS recovers immediately. The 5-year warranty backs it. This is the most feature-rich marine battery on this list, combining Bluetooth, salt resistance, and a sturdy BMS.
Salt-Ready: The specific mention of “salt-resistant” construction makes this the only battery on the list explicitly built for corrosive marine environments. The app controls allow you to kill power remotely without accessing the battery compartment.
Best for: Saltwater anglers and boaters who need a tough, app-connected battery that can handle spray and corrosion.
Think twice if: You are on a tight budget — the Bluetooth and IP65 features push the price above simpler models.
11. LiTime 12V 100Ah Group 24 Bluetooth
The 21.9-pound Bluetooth version of the top-rated Litime family, built for those who want app monitoring without extra hardware.
This is the Bluetooth version of the Litime Group 24 battery, dropping the weight to 21.9 lbs (lighter than the larger Group 31 version) while adding full phone connectivity. The app shows you SOC, voltage, and charging status instantly, so you never have to crawl under your RV or boat console to check battery health. One owner used it to run a 60-inch TV and a powerful Yamaha stereo for over 5 hours “with energy left,” which is a strong indicator of the 1280Wh usable capacity. The battery life is the most praised aspect, with 47 owners highlighting it specifically. The battery holds a half-charge perfectly for emergency storage.
The internal 100A BMS provides all-weather cold protection, stopping charging below 32°F and discharging below -4°F. Automotive-grade LiFePO4 cells deliver up to 15,000 deep cycles. The warranty is 5 years, and the battery carries CE and RoHS certifications. AIG product liability insurance covers it from May 2026 onwards. It fits Group 24, 27, and 31 boxes, making it a versatile drop-in replacement. The one real-world limitation is that the app is not critical for every user — some owners say it is “nice but not necessary,” so if you are price-sensitive and do not need Bluetooth, the non-Bluetooth Litime (Product 1) is a better value.
What Stands Out
- Bluetooth monitoring is built-in and works flawlessly for checking charge via phone
- Lightest LiTime 100Ah offering at 21.9 lbs
- Fits Group 24/27/31 trays, making it the most flexible drop-in size option
The Trade-Off
- Higher cost than the non-Bluetooth Litime version for essentially the same core battery
- Bluetooth app is a convenience, not a necessity, for users with a simple setup
Choose this if: You want the proven Litime quality combined with the convenience of app-based battery monitoring from your phone.
it’s not for you if: You are on a strict budget — the standard Litime (Product 1) offers the same 100A BMS and cycle life for less money.
Understanding the Specs
BMS Amperage (100A BMS)
The BMS, or battery management system, is the internal computer that keeps your battery safe. A 100A BMS means the battery can safely deliver up to 100 amps of continuous current — that is about 1,280 watts of power at 12.8 volts. This is enough to run a small RV air conditioner, a trolling motor on high, or a fridge plus lights. If your device draws more than 100A for more than a few seconds, the BMS will shut down to protect the cells. Always check the peak surge rating (often 300-500A for a fraction of a second) for starting motors.
Depth of Discharge (DoD) and Cycle Life
Depth of discharge tells you how much of the battery’s rated capacity you can safely use before recharging. “100% DoD” means you can drain the battery completely flat without damaging it, which is a key advantage of LiFePO4 chemistry. Cycle life is the number of full charge-discharge cycles a battery can handle before its capacity drops to 80%. A battery rated for 4,000 cycles at 100% DoD will last roughly 10-11 years if cycled daily. Some manufacturers also list 15,000 cycles at 60% DoD — that means if you only use 60% of the capacity each time, the battery lasts even longer.
FAQ
Can I replace my lead-acid battery directly with a LiFePO4 battery?
Will a 100Ah battery run my RV air conditioner?
Can I connect multiple LiFePO4 batteries in parallel or series?
How many years will a 12V 100Ah LiFePO4 battery last?
Do I need a special charger for a LiFePO4 battery?
What happens to a LiFePO4 battery in cold weather?
Is Bluetooth battery monitoring worth paying extra for?
Can I use a LiFePO4 battery as a starter battery for my engine?
How do I store a LiFePO4 battery long-term?
What is the difference between Group 24 and Group 31 battery sizes?
Final Thoughts: The Verdict
For most people, the best batterie lithium ion 12v 100ah winner is the Litime 12V 100Ah because it balances an incredibly long cycle life, a solid 100A BMS, and a proven track record across hundreds of RV and solar owners. If you want Bluetooth monitoring and a lighter weight, the LiTime 12V 100Ah Group 24 Bluetooth gives you the same core quality with app connectivity. And for the tightest spaces, the Renogy 12V 100Ah Mini is the one to reach for — its compact Group 22NF size makes it perfect for teardrop trailers and kayaks.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, KitchPrep earns from qualifying purchases. This does not affect which products we feature.
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