Introduction — Why “100Ah” Matters
A 12V 100Ah lithium battery is one of the most popular deep-cycle capacities for RVs, trolling motors, solar storage, and off-grid backup systems. OKMO has developed several variations of its 12V 100Ah LiFePO4 battery to fit different applications, including Group 24, Group 31, and TM (Trolling Motor) versions.

Shared Core Technology (What They All Have in Common)

All three models are built with A-grade LiFePO4 cells and an integrated 100A BMS (Battery Management System). They support deep cycling, have very low self-discharge, and can achieve thousands of cycles — often exceeding a 10-year lifespan. Each battery comes with protections for overcharge, over-discharge, overcurrent, short circuit, and low temperature. Weighing around 23 lbs (10.5 kg), they offer a significant performance advantage over lead-acid batteries in terms of efficiency and lifespan.

Key Differences — Form Factor & Application Fit

1) 12V 100Ah — Group 24

Group 24 is a compact, industry-standard size commonly used in small RVs, light marine vessels, and vehicles. OKMO’s Group 24 model is designed as a drop-in replacement for lead-acid batteries of the same size. With M8 (or similar bolt-type) terminals, it is the best choice for tight compartments where space efficiency is critical.

2) 12V 100Ah — Group 31

Group 31 is slightly larger than Group 24, with a taller and wider casing. This makes it a great fit for larger RVs, pickup trucks, or solar storage systems where space allows. OKMO’s Group 31 models often include optional Bluetooth monitoring, enabling real-time battery status and capacity tracking. It’s a good choice for long-term fixed installations, series/parallel expansions, or when remote monitoring is needed.

3) 12V 100Ah — TM (Trolling Motor)

The TM version is specifically engineered for trolling motors and marine applications. With enhanced BMS protection, improved water and corrosion resistance, and low-temperature cut-off features, it is designed to withstand harsher outdoor environments. OKMO recommends this version for 30–100 lb thrust trolling motors. Some TM models also include Bluetooth functionality to help anglers monitor real-time usage and performance curves. In short, the TM version is a marine-optimized 100Ah battery built for boating and fishing needs.

Other Comparison Points

• Terminal Type:
  Group 24/31 models typically use M8 bolt terminals, while the TM version may feature reinforced, corrosion-resistant terminals for quick marine connections.

• Series & Parallel Expansion:
  All versions support both parallel expansion (higher capacity) and series connection (higher voltage systems). However, OKMO notes that the TM model has additional safety guidelines for parallel use in marine setups.

• Charging & Compatibility:
  Each battery works with LiFePO4-compatible chargers, solar charge controllers, and DC-DC chargers. Group 31’s larger form factor also helps with heat dissipation during heavy cycling.

Buying Guide (Which One Should You Choose?)

• Choose Group 24 if you are replacing a lead-acid battery in a compact compartment or small RV.

• Choose Group 31 if you have more space and want extra features like Bluetooth monitoring and better suitability for series/parallel expansions.

• Choose TM (Trolling Motor) if your main use case is boating, fishing, or powering trolling motors. Its rugged build, saltwater resistance, and marine-oriented BMS make it the best option for water use.

Conclusion

While all three OKMO 12V 100Ah models share the same core chemistry (LiFePO4 + 100A BMS) and performance benefits, the differences come down to form factor (Group 24 vs. Group 31) and application optimization (TM for marine use). When choosing, focus on battery compartment size, terminal type, environment (land vs. marine), and whether you need monitoring or expansion options.

By aligning your choice with your specific setup, you can ensure you get the best performance and longest lifespan out of your OKMO 100Ah lithium battery.