How to repair the lead-acid battery of motorcycle
We can use a more powerful charger to charge the battery. When the battery get hot, then stop charging till the temperature gets down. We can repeat these steps for 2-3 days a few times, it may work.
Firstlly, check the battery to confirm whether it is short of water, if this, we can recharge for the battery with the rated charge current 1/10 until full, then the rated capacity of 1/10 discharge, until the end of the three or four cycle.