Mighty Max ML35-12GEL 12V 35AH GEL Battery — NB Replacement Compatible with Heartway Rumba HP4 Power Electric (2-Pack)

ML35-12GEL is a 12V 35AH GEL rechargeable, maintenance-free battery sold as a 2 Pack. Designed as an NB replacement compatible with Heartway Rumba HP4 Power Electric, these GEL batteries offer dependable, long-lasting energy. Compared with AGM cells, they have a slower self-discharge rate, so they hold charge longer when idle — an excellent upgrade if extended standby retention is important. Built to perform across a wide temperature range, the ML35-12GEL sustains reliable output in both hot summers and cold winters thanks to its resistance to temperature-related performance drops. The batteries use a thick, non-spillable gel paste that minimizes leak risk and reduces the chance of acid spills or harmful fumes. That gel construction also helps the batteries withstand vibration and shock, making them suitable for tough or mobile applications. Backed by Mighty Max’s reputation for quality and reliability, these GEL batteries deliver improved discharge characteristics, enhanced safety, consistent performance, and a longer service life.