TYKOOL 400 CCA 8Ah, Group U1 LiFePO4 Lithium Lawn Mower Battery, Garden Tractor Battery, Compatible for Ride on Lawn Tractor and Mower, Fits for Cub Cadet, John Deere, Troy-Bilt Mower, Craftsman [+ -]

What It Is

The TYKOOL 400 CCA 8Ah Group U1 LiFePO4 lithium battery is a direct drop-in replacement for standard lead-acid Group U1 batteries used in riding lawn mowers, garden tractors, and zero-turn mowers. It delivers 400 cold cranking amps (CCA) to reliably start engines up to ~20 HP, and is designed for machines from Cub Cadet, John Deere, Troy-Bilt, Craftsman, and other major brands.

Fitment & Compatibility

Before buying, confirm your mower uses a Group U1 battery—this is a standard size (approx. 8.3" L x 5.1" W x 7.5" H) with top terminals (positive left). Measure your existing battery tray to ensure it fits; this battery is slightly taller than some lead-acid U1s (7.5" vs. ~7.0"). Check that your mower’s charging system outputs 13.5–14.5V (most modern tractors do). It is not compatible with 6V systems or mowers that require a Group 22NF or larger battery. OEM part numbers: Cub Cadet 725-04251/725-04359, John Deere TY24432, Troy-Bilt 725-04251, Craftsman 725-04251.

Key Things to Know

• Installation is straightforward—disconnect the old battery, swap the cables (positive to positive, negative to negative), and secure it. No programming or adapter needed.
• Weighs ~3 lbs vs. 10–15 lbs for lead-acid, making it easier to handle and reducing vibration stress on the tray.
• Built-in Battery Management System (BMS) protects against overcharge, deep discharge, and short circuits—no watering or maintenance required.
• Cold weather performance is slightly reduced below 32°F; if you store the mower in an unheated shed, expect slower cranking until the battery warms up.

Should You Buy It

Buy this if you want a lightweight, maintenance-free upgrade that lasts 3–5x longer than lead-acid (rated for 2,000+ cycles) and cranks reliably in moderate climates. Skip it if you mow in sub-freezing temps regularly or need a budget option—a standard lead-acid U1 costs half as much.