12.8V 100Ah LiFePO4 Deep Cycle Battery

A drop-in Group 27/31 replacement built to outlast and outperform lead-acid.

Lead-acid batteries were never built to keep up with how hard you actually use your gear — heavy, slow to recharge, and dead again just when you need them most. The Mach 1 12.8V 100Ah LiFePO4 battery replaces that weight and hassle with lithium iron phosphate technology built for thousands of charge cycles, not hundreds. It's a drop-in replacement for Group 27 and Group 31 lead-acid batteries, so upgrading doesn't mean rebuilding your whole power system — just swapping in a battery that lasts 8 to 10 times longer, delivers more usable capacity, and weighs a fraction as much.

Whether it's running a trolling motor and fish finder all day on the water, backing up a solar array, or keeping an RV's systems alive off-grid, this battery is built to work as hard as you do — with a built-in Battery Management System guarding against overcharge, over-discharge, overcurrent, and short circuits.

Key Features

• Advanced LiFePO4 chemistry — more stable, safer, and longer-lasting than traditional lead-acid
• 8-10x longer lifespan than SLA batteries — thousands of charge cycles instead of hundreds
• More usable capacity, far less weight — full 100Ah of usable power without hauling a lead-acid brick
• Drop-in SLA replacement — compatible with Group 27 and Group 31 battery systems
• Built-in BMS — protects against overcharge, over-discharge, overcurrent, and short-circuit events
• Maintenance-free and eco-friendly — no acid, no heavy metals, nothing to top off or monitor

Best For

• Trolling motors and marine electronics (fish finders, livewell pumps, GPS)
• RV house battery systems
• Off-grid and backup solar storage
• Any 12V deep-cycle application currently running lead-acid

Specifications

FAQ

1. Can this replace my existing Group 27 or 31 battery directly?
   Yes, it's a drop-in replacement for Group 27 and Group 31 lead-acid batteries — no system rebuild required.
2. How does this compare to a lead-acid battery?
   It delivers 8-10 times longer cycle life, more usable capacity, and a fraction of the weight.
3. What applications is this battery best suited for?
   Trolling motors, marine electronics, RV house battery systems, and off-grid or backup solar storage.
4. Does it require any maintenance?
   No, it's maintenance-free — no acid, no heavy metals, nothing to monitor or top off.

You May Also Need

Need a different capacity? See the 12.8V 20Ah or 12.8V 50Ah LiFePO4 batteries, or browse the full range in 12V LiFePO4 Batteries and Deep Cycle Batteries for RV & Solar.

Why Choose Mach 1

Built on the same lithium expertise behind our power tool batteries and chargers — a battery designed to outlast and outperform the lead-acid it replaces, backed by a team that actually understands the chemistry.