Measure the voltage of your battery using a multimeter.if it show expected output voltage,wait for sometime and check multimeter volt reading.if it again show expected voltage,the battery may have no problem and the problem is with the charging circuit.if the reading is lower than expected voltage the battery is damaged.
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Measure the voltage of your battery using a multimeter.if it show expected output voltage,wait for sometime and check multimeter volt reading.if it again show expected voltage,the battery may have no problem and the problem is with the charging circuit.if the reading is lower than expected voltage the battery is damaged.
Checking charging circuit:
1.check dynamos.
2.check wire continuity.