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Differences in Power Sport Batteries

Obviously size does matter as does proper voltage and amperage. Just because it fits the space does not mean it’s the correct battery for your bike. Batteries come with an OEM number which closely resembles the almost “generic” number that Yuasa uses. Yuasa is the “standard” all motorcycle batteries attempt to emulate so you will see their part numbers utilized in some fashion on most all power sport batteries. But in addition to size, voltage and amperage – you basically need to decide between a Conventional and an AGM Maintenance Free battery. Ok, you do have two kinds of maintenance free batteries. Oh, also a gel cell battery. So, what’s the difference?

Conventional batteries are more often seen in older bikes, are the cheapest battery, generally referred to as Vented or Flooded, and have a vent tube. They give good service, but do require regular maintenance by topping off with distilled water as water loss is normal with these units. If the water level falls below the “minimum” line, permanent damage can occur to the battery as the lead plates become exposed to the air. You buy these batteries dry (no acid) with about a 70% charge. Upon arrival acid is added, the battery is charged and then into the bike it goes. Most of these batteries can be upgraded to AGM battery if so desired.

Maintenance Free AGM batteries are sometimes called sealed batteries - no maintenance is required. Maintenance free batteries are of Absorbed Glass Mat construction. The glass mat holds the suspended electrolytes in close proximity to the plate's active material and enhances both the discharge and recharge efficiency. AGM batteries are high performance batteries designed to give superior performance over conventional batteries. However, like conventional batteries, AGMs are not deep cycle batteries and typically require regular charging before the battery reaches 50% discharge to maintain longest life and hottest performance. They come in Self-Sealed (you add acid and seal battery) or Factory Sealed variations. One is more expensive than the other. Once sealed, you never check them again. While these batteries are technically wet batteries, they have properties similar to Gel Cells and are often confused with Gel Cell batteries. These are NOT gel cell batteries and most charging systems on bikes are not designed for gel cell.

Gel Cell batteries are great batteries, but not for everything. The electrolyte is a gel substance derived from the chemical reaction between a silica additive and the acid. It is different from the AGM as the AGM is technically still a wet cell. The gel is just that – a gel. Typically, gel cells are charged at a lower voltage than a wet cell battery. Gel Cell batteries are not for every motorcycle as many bikes will likely overcharge a gel if not specifically designed for gel batteries. If you want to use a gel cell in your bike, measure the voltage at your battery with the engine at fast idle. If you measure 13.5vdc or under, you should be fine with a gel. If over 13.5vdc, you probably should stick with an AGM.

If a new battery is in your future, check a battery fitment guide from one of the major manufacturers before buying. Only by finding what options are available will you be able to make an informed decision.