YTX9-BS GEL Replaces Kymco 150 MXU150 2010-2011 With 12V 2Amp Charger When a Gel Cell battery is charged, no hazardous fumes escape the battery case, gases are processed within the battery itself. The Mighty Max YTX9-BS GEL is a TRUE DEEP CYCLE battery that can be mounted in any position, requires no maintenance.