WORN BATTERY
Voltage check: If the battery is worn, the centre "V" LED may indicate initially but the voltage is likely to drop when the ignition is switched on.
Cranking: The instant the ignition key is turned (or starter button is pushed) the battery must provide very high current and at the same time remain at a voltage level necessary to get the starter motor running quickly and smoothly. A drop into red zone indicates a worn / weak battery. During cranking the voltage will rise slightly until the motor fires. If the voltage does not rise close or into the green zone the ignition system will provide a weak spark and the engine may struggle to start.
NOTE: The lower the initial and subsequent voltage during cranking, the longer it will take before the engine starts.
Charging: With the engine running the charging system should recharge the battery. An even and steady rise is an indication of a good charging system and a strong battery. The more worn the battery the faster the rise. As the battery forms part of the system's resistance, a worn battery may allow the charging voltage to rise higher than normal.
NOTES: Charging systems: some power-sport vehicle systems may charge at a slightly higher voltage. This is normal. A worn battery will allow an even higher voltage which speeds up it's deterioration and early and sudden failure.
Two factors contribute early battery failure -
- Failure to charge the new battery properly before putting it into service. Typically, acid is put into the battery and battery is fitted to the vehicle without charging. Use the correct charging procedure and charger before fitment to optimize battery service life.
- Under-charging during use / neglect during storage. Lead sulfate forms on the plates of a battery that is not fully charged. The lower the charge the quicker the battery will 'sulfate' and die. Prevent early failure and extend battery life by using a charger such as TecMate's OptiMate desulfater-charger or AccuMate range which can desulfate and fully recharge the battery between use.