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Sediment can build up in the bottom of a battery as a result of chemical reactions inside of it. This sediment can build up until it grounds out the plates inside.
To clean sediment out:
1. drain the acid
2. wash out several times with water to remove all the sediment
3. refill with electrolyte
4. hook the battery up to a trickle charger no larger than 2 amps and bring it up slowly over a 24-hour period
5. check it with a gauge or meter
6. stick it back in the bike. You're ready to ride again.