12V 100Ah LiFePO4 Battery Group 31 - Long Life Deep Cycle

Our review of the 12V 100Ah LiFePO4 Battery Group 31 finds it best suited for owners of RVs, boats, small off-grid solar systems and van conversions who need a durable deep cycle replacement that stays light. The single biggest reason to consider this unit is its emphasis on long lifespan: GREENOE packages Grade A+ LiFePO4 cells with a claimed 15000+ charge-discharge cycles and a 36-month warranty, which promises a decade or more of reliable service if used correctly. The review covers performance, cold-weather behavior and real customer feedback on charging quirks.

Key Features

• Grade A+ Cells: Uses higher energy density LiFePO4 cells that are described as stable and intended to deliver a long usable life compared with typical lead acid replacements.
• Long Lifespan: The manufacturer states 15000+ cycles, which suggests this battery is designed for heavy daily cycling and long-term cost efficiency.
• Built-in 100A BMS: Integrated battery management protects against over-charge, over-discharge, over-current and short-circuit, reducing the chance of user error causing damage.
• Smart Low Temperature Cut-Off: The BMS blocks charging below 32F and discharging below -4F to protect cells in freezing conditions, useful for winterized RVs and cabins.
• Compact Group 31 Size: At roughly 12.9 in x 6.7 in x 8.6 in and 22.48 lbs, it fits Group 31 boxes and is noticeably lighter than equivalent lead acid batteries for easier installation and transport.
• Expandable Flexibility: Supports series and parallel connections for higher voltage or capacity, and a short burst discharge up to 300A for high-load trolling motors and inverter starts.

Who It's For

This battery is a strong option for RV owners, boaters running trolling motors, off-grid solar users and van converters who need a durable deep cycle battery that is compact and lighter than lead acid. The long cycle life and integrated BMS make it attractive for people who expect repeated charge-discharge cycles and want lower replacement frequency.

Those who should look elsewhere include users needing a true starter battery for engine cranking or people who cannot provide a proper 14.6V LiFePO4 charger; a standard 12V charger will not fully charge this chemistry and some customers reported voltages that did not exceed about 13.3V without the correct charger.

Pros & Cons

Pros

• Long rated lifespan and Grade A+ cells promise durable performance for many years of cycling.
• Lightweight and Group 31 compatible, making installation easier in tight spaces.
• Built-in BMS and temperature control add safety and protect the battery in cold conditions.
• Expandable in series or parallel to suit higher voltage or capacity needs.

Cons

• Requires a 14.6V LiFePO4-compatible charger to fully charge; some buyers report the battery not rising above ~13.3V with standard 12V chargers.
• Not designed for engine starting; optimized for deep-cycle use such as trolling motors and house loads.

Specifications

Nominal Voltage	12.8V
Capacity	100Ah
Cell Chemistry	LiFePO4 (Grade A+)
BMS	Built-in 100A with temperature cut-off
Max Short Burst Discharge	300A (3 seconds)
Dimensions	12.9 in x 6.7 in x 8.6 in
Weight	22.48 lbs

Our Verdict

For users who need a dependable, lightweight Group 31 deep cycle battery, this GREENOE 12V 100Ah LiFePO4 unit represents good value thanks to long cycle life, integrated protections and compact size. It is especially suited to solar setups, RV house systems and marine trolling motors, provided the owner uses a correct 14.6V LiFePO4 charger and understands it is not a starter battery.

Frequently Asked Questions

Will a standard 12V charger work?
A standard 12V charger will not fully charge a LiFePO4 battery; use a 14.6V 0.2V LiFePO4-compatible adapter or charger to bring it to full state of charge.

Can multiple batteries be combined?
Yes, batteries can be connected in series for higher voltage (up to 51.2V with 4 in series) or in parallel to increase capacity; follow proper balancing and connection procedures.

Is this battery waterproof for marine use?
The battery has an IP65 rating, making it resistant to water jets and suitable for many marine and outdoor installations, though it should not be submerged.