Powersports battery glossary
The terms that actually matter when you are buying a battery, explained in one line each. No jargon, no fluff.
Battery
- Cold Cranking Amps (CCA)
- CCA is the current a battery can deliver for 30 seconds at 0°F while staying above 7.2 volts. Higher CCA means stronger cold-weather starting. It is the most important rating for cold climates. Always match or exceed the CCA your machine's battery specifies.
- Cranking Amps (CA)
- CA measures cranking current at 32°F instead of 0°F, so the number is always higher than CCA for the same battery. Sometimes labeled MCA (marine cranking amps) on PWC and marine batteries. Do not confuse a high CA figure with CCA.
- Amp Hours (Ah)
- Amp hours measure a battery's capacity: how many amps it can supply over time. Powersports batteries are typically 2.5 to 20 Ah. Ah is capacity (how long it runs accessories); CCA is cranking power (the burst that starts the engine). They are different measurements.
- Reserve Capacity (RC)
- Reserve capacity is how many minutes a fully charged battery can run a set load before dropping to 10.5 volts. It is more common on larger marine and deep-cycle batteries.
- AGM Battery
- An AGM (absorbent glass mat) battery holds its acid in fiberglass mats, so it is sealed, spill-proof, and vibration-resistant. Nearly all modern powersports batteries are AGM. The factory battery on most motorcycles, ATVs, scooters, and PWCs is a sealed AGM. You can replace it with the same AGM code or a lithium drop-in in the same case.
- Lithium (LiFePO4) Battery
- A LiFePO4 (lithium iron phosphate) battery is a lightweight drop-in alternative to AGM, made in the same case sizes. It weighs far less and lasts longer, but needs a lithium-aware charger. Lithium is the common powersports upgrade: roughly 60 to 70 percent lighter, slower to self-discharge, but pricier and sluggish for the first cold crank until it warms up.
- Flooded (Conventional) Battery
- A conventional flooded battery has liquid electrolyte you add on first use and may need to top up. Older and vintage powersports codes (many bare YB types) are this design.
- Battery Size Code
- A code like YTX14-BS or YB12A-A defines a powersports battery's case size, terminal layout, and capacity. Matching the code is what makes a replacement fit. The prefix indicates the family and chemistry (YTX and YTZ are sealed AGM lines), the number roughly tracks size, and a -BS suffix means it ships dry with an acid pack and is then sealed AGM.
- The -BS Suffix
- A -BS suffix (Bottle Supplied) means the battery ships dry with an acid pack you add once. After filling it self-seals into a maintenance-free AGM battery.
- Terminal Layout
- The terminal layout is which side the positive and negative posts sit on. Batteries with the same size code share a layout, so the cables reach - always match it.
Charging
- Battery Tender / Maintainer
- A smart maintainer (tender) keeps a parked battery topped up without overcharging. It is the standard fix for a bike that sits, especially over winter. Use one with a lithium mode for a lithium battery. An old dumb trickle charger can damage a lithium pack.
- Parasitic Draw
- Parasitic draw is the small current a machine uses while parked and off - an alarm, immobiliser, clock, or ECU keep-alive. It is what flattens a battery in storage.
- Self-Discharge
- Self-discharge is a battery slowly losing charge while sitting unused. Lithium self-discharges far more slowly than lead-acid, so it stores better.
General
- Fitment
- Fitment means whether a part is built to fit a specific year, make, and model. A battery that fits one sub-model or displacement may not fit another, so fitment is checked by exact machine.
- OEM
- OEM (original equipment manufacturer) means a part matching the maker's exact specification, the same as what came on the machine from the factory.
- Aftermarket Part
- An aftermarket part is made by a company other than the original manufacturer. Quality ranges from economy to better-than-OEM; the key is that it meets the correct fitment and specs.