AGM batteries are sealed lead-acid batteries that are inexpensive, tolerant of most chargers and dependable in cold weather. Lithium iron phosphate (LiFePO4) batteries weigh a fraction as much and hold their charge longer in storage, but cost more, can be sluggish in deep cold and need a lithium-compatible charger. Use a smart maintainer suited to your battery type during storage.
Batteries are the most common reason a machine will not start after storage. The type you choose changes how you care for it.
Compared
| AGM | Lithium (LiFePO4) | |
|---|---|---|
| Weight | Heavy | Much lighter |
| Price | Lower | Higher |
| Cold starts | Strong | Can need warming in deep cold |
| Self-discharge in storage | Faster | Slower |
| Charger | Standard or AGM mode | Lithium-compatible only |
| Lifespan | Typically several seasons | Often longer with proper care |
Fitment
Use your owner’s manual or the battery maker’s lookup by make, model and year. Match:
- Physical size and terminal positions.
- Cold cranking amps (CCA) at or above the original.
- For lithium, the maker’s recommended capacity for your engine size.
Machines that run a winch, heated grips or extra lights need a battery and charging system that keep up.
Storage
- Fully charge before storage.
- Use a smart maintainer that matches the battery type.
- Store in a cool, dry place; disconnect if you cannot use a maintainer.
Safety
Wear eye protection, connect positive first and remove negative first, and never charge a frozen or swollen battery.
See also oil and chain care and, for riders new to maintenance, new riders.
Browse maintenance and tools.
Common questions
Can I charge a lithium battery with a regular charger?
Use a charger with a lithium mode. Some lead-acid chargers have a desulfation or float mode that can damage lithium batteries.
Do lithium batteries work in cold weather?
They can be weak on the first crank below freezing. Many makers suggest turning on the headlight for a short time to warm the battery before starting.
How do I size a replacement battery?
Match the physical size, terminal layout and cold cranking amps (CCA) to your owner's manual or the battery maker's fitment chart.
What does a battery tender do?
It keeps a stored battery at full charge without overcharging, which extends battery life over winter.