Litime 12V 100Ah Group 31 LiFePO4 Bluetooth Battery
$289
Key Specs
| capacity | 100Ah |
| voltage | 12V |
| chemistry | LiFePO4 |
| weight | 24.2 lbs |
| dimensions | 13.0 x 6.8 x 8.7 in |
| bms | 100A integrated |
| warranty | 5 years |
Pros
- ✓ Built-in Bluetooth lets you monitor SOC from your smartphone
- ✓ Group 31 form factor fits standard battery trays in RVs and boats
- ✓ Integrated 100A BMS handles overcharge, over-discharge, and short circuit
- ✓ Up to 4000 cycles for a long service life
Cons
- ✗ Bluetooth app can be slow to connect in cold conditions
- ✗ No low-temperature charge cutoff on base model
Detailed Review
Overview
Litime has built a strong following in the lithium battery market by delivering solid LiFePO4 performance at accessible price points, and the 12V 100Ah Group 31 Bluetooth model continues that trend. What sets this battery apart from the base lineup is a built-in Bluetooth module that pairs with the free Litime app on iOS or Android. From your phone, you can check state of charge, voltage, current draw, and charging status in real time — no separate battery monitor required.
The Group 31 footprint is a practical choice. It matches the tray dimensions found in the majority of RV house battery compartments, sailboat battery banks, and solar storage cabinets. Swapping out an existing AGM Group 31 is typically a direct bolt-in, which makes this battery an appealing upgrade path for anyone who wants to step up to lithium without custom fabrication.
Key Features
The integrated 100A Battery Management System is the backbone of safe operation. It monitors each cell for overvoltage and undervoltage conditions, watches for excessive current draw, and provides short-circuit protection. The BMS also balances cells passively during charging to extend pack longevity. At only 24.2 pounds, the Litime is roughly half the weight of an equivalent AGM Group 31, which matters on a boat where weight distribution affects performance.
Cycle life is rated at up to 4,000 full discharge cycles at 80% depth of discharge, translating to over a decade of daily use in most off-grid applications. The five-year warranty is competitive in the mid-range segment and covers manufacturing defects.
Performance and Capacity
With 100Ah at 12.8V nominal, this battery stores 1,280Wh of energy. Because LiFePO4 chemistry supports nearly full depth of discharge without degradation, you get access to almost the entire rated capacity — roughly double the usable energy of a same-sized AGM. The Bluetooth monitoring feature pays dividends here: knowing your exact SOC prevents accidental over-discharge far more reliably than guessing from terminal voltage.
The battery accepts charge rates up to 100A, meaning a properly sized lithium charger can complete a full recharge in about one hour under ideal conditions. This makes it a natural fit for solar systems where charging windows are limited to peak sun hours.
Who It’s For
The Litime 100Ah Bluetooth Group 31 is an excellent choice for RV owners doing their first lithium upgrade, boaters who want smartphone monitoring without buying a separate shunt, and solar storage builders on a budget. The Bluetooth feature alone justifies the modest price premium over non-connected alternatives, especially for anyone who values knowing their exact battery state at a glance.
