Redodo 12V 20Ah Lithium LiFePO4 Battery, 800CCA Cranking Battery, Group U1 Marine Battery Built in BMS, 40C Discharge Lithium Battery for Outboard Motor, Lawn Mower

What It Is

The Redodo 12V 20Ah LiFePO4 battery delivers 800CCA for starting engines in lawn mowers, outboard motors, and other powersports equipment. It replaces lead-acid group U1 batteries with a lighter, lithium-based drop-in designed for high-cranking applications.

Fitment & Compatibility

• Physical size: Must fit a Group U1 battery tray (approx. 7.7" L x 5.1" W x 6.0" H). Measure your existing battery compartment before ordering—some mower trays are slightly smaller or have different terminal layouts.
• Terminal type: Standard SAE posts (top-mount). Verify your cables reach and the terminal orientation matches.
• Voltage & CCA: 12V system only. 800CCA is sufficient for most lawn tractors with engines up to ~25hp, but check your mower’s minimum CCA requirement (often listed in the manual or on the old battery).
• OEM vs aftermarket: Works as a direct replacement for any Group U1 lead-acid battery, but not compatible with mowers requiring a specific BMS communication protocol (rare in lawn equipment).
• Charging system: Must have a lithium-compatible charger or a mower alternator that doesn’t exceed 14.6V. Lead-acid chargers can damage the BMS.

Key Things to Know

• Built-in BMS: Protects against overcharge, over-discharge, short circuit, and high temperature. It will shut off the battery if voltage drops too low—some mowers may not restart after storage without a dedicated lithium charger to wake the BMS.
• Weight savings: ~5 lbs vs ~15 lbs for lead-acid, but the lighter weight can change balance on some riding mowers (check if your battery is used for ballast).
• Installation difficulty: Easy—remove old battery, clean terminals, install, and torque to 5-7 ft-lbs. No acid handling or watering needed.
• Common gotcha: The 3.2/5 rating suggests mixed reliability. Some users report early BMS failures or reduced CCA in cold weather (LiFePO4 performance drops below 32°F). If you mow in winter, consider a heated lithium battery or stick with lead-acid.

Should You Buy It

This battery is a good fit if you want a lightweight, maintenance-free upgrade for a lawn tractor or mower used in warm climates, and you already have a lithium-compatible charger. Skip it if you need cold-weather reliability, your mower’s charging system is unregulated, or you prefer a proven brand with stronger reviews—at this price and rating, the risk of early failure is higher than average.