The GS500 stock battery is a Yuasa brand #YB10L-B2. The specifications for the stock battery are 12 V and 11 A-h (estimated cold cranking amps are 62 A). The stock battery is not very common because it has its vent hose on the right hand side.

The dimensions of the stock battery are:

  • Length 5 5/16" (135.0 mm)
  • Width 3 9/16" (90.5 mm)
  • Height 5 3/4" (146.0 mm)

Official specs: Official charging amps = 1.1

A similar battery is available with the vent hose on the left hand side (Yuasa YB10L-A2). This alternative is more common than the stock battery: less expensive and easier to find at common suppliers (WalMart, auto parts stores, etc). Because the battery vent is on the opposite side, the vent hose will have to be re-routed along the left side of the motorcycle. With the battery vent now on the left side, overfilling of the battery may result in spilling of acid onto the motorcycle swingarm when the bike is on the sidestand (i.e. leaning to the left).

A potential clone of the original battery, is UB10L-B2, made by upg "adventure power". Use of this battery has not yet been confirmed, but seems likely.

Another alternative is to use a sealed battery. A popular sealed battery is available at WalMart (ES12BS). The dimensions of this battery are different than stock, so it must be mounted sideways on the motorcycle. This may also require adjustment of the battery wiring.