Maintenance free motorcycle battery charging method.
Sealed/maintenance free (also know as dry cell) batteries normally have have black cases and a plastic strip to cover the 6 filling holes in the top of the battery.
Unlike conventional batteries, once these batteries have been filled and the cap is placed in the top, the battery is ‘sealed for life’ and doesn’t need to be removed or the acid levels monitored or topped up.
The batteries usually start with the code YTX, CTX, GTX, DTX or ETX (e.g. YTX9-BS