Bought a used buddy 125 scooter. I replaced the battery and now the battery has drained below starting power
Must have a short, is it fitted with an alarm? also make sure it is charging the battery in the first place and isn't just draining it as you ride.
The scooter does not have an alarm. The alternator is not charging the brand new battery. I think it may be the ignition switch, however I am not sure how the switch is supposed to respond with low battery power. The alternator peaks at 13.4v when the engine is running, but the battery voltage drops below 6v after the engine is shutoff.
I'm afraid that sounds like the battery is as fault
...it is a 12v battery fitted not a 6v? to take a 12v battery down below 6 volts means more than half the cells are dead. Anything causing such a drain would be obvious by getting hot. Final checks before your return the battery: 1. check electrolyte levels in the battery. 2. when the leads are disconnected from the battery, ensure ignition is off, check continuity to earth on any of the leads on the positive terminal it should be open circuit.
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Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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