How To Tell If Power Wheels Battery Is Bad. Insert a good fuse into the battery with the contacts facing down. If the voltage is closer to 12 Volts or less the alternator is not charging the battery and the battery is likely OK.
There are some sure ways you can tell if your battery is bad by simply taking a good look. Some users have tried to modify and upgrade their power. If the battery is at 126 volts or above then it has taken a full charge however the capacity of the battery may have diminished so low that it is unable to sustain enough power to move the Power Wheels toy for any extended amount of time.
Power wheel batteries are usually made to last 3-4 years if it receives ideal maintenance even during seasons when it is not being used.
If its terminals were not all that nasty and the alternator charging Volts looks good the battery is likely Bad. If its terminals were not all that nasty and the alternator charging Volts looks good the battery is likely Bad. If its any lower than that the charger wont receive enough power to get started. However you need to design the battery bank to safely fail when a cell dies otherwise you can cause a cascade failure of venting and possibly igniting cells.
