Mighty Max ML35-12GEL 12V 35AH GEL Replacement Battery for Heartway Rumba S HP-4 - 2 Pack

ML35-12GEL is a 12V 35AH GEL rechargeable, maintenance-free battery sold as a 2-pack. Designed as a direct replacement for Heartway Rumba S HP-4, these GEL cells retain charge longer than AGM batteries thanks to a slower self-discharge rate, making them a strong upgrade for devices that sit idle between uses. Built to perform across a wide range of climates, Mighty Max GEL batteries maintain reliable output in extreme heat and cold and tolerate temperature swings without significant loss of power. The internal composition uses a thick, non-spillable gel paste that reduces the chance of leaks, minimizes acidic fumes, and provides enhanced resistance to vibration and shock for demanding environments. Backed by Mighty Max’s reputation for dependable power solutions, these GEL batteries offer improved discharge behavior, greater safety, consistent performance, and extended service life.