Mighty Max ML35-12GEL 12V 35AH GEL NB Replacement Battery — Compatible with Doorking 6003 20W Solar Control Box (4 Pack)

ML35-12GEL is a 12V 35AH GEL rechargeable, maintenance-free battery sold as a 4 pack and suitable as an NB replacement for the Doorking 6003 20W Solar Control Box. Each battery uses GEL technology and is designed for dependable standby and cyclic applications. Longer holdover when idle: These GEL cells have a slower self-discharge rate than AGM batteries, so they retain charge longer during storage or periods of low use. That makes them a practical upgrade when extended shelf-life between charges is important. Built for temperature extremes: Mighty Max GEL batteries are engineered to deliver stable performance across a wide range of climates. Their construction helps maintain reliable power output whether operating in very hot or very cold conditions. Safer, rugged construction: The thick, non-spillable gel paste reduces the chance of leaks and eliminates hazardous acid spills and fumes. This sealed design also improves resistance to vibration and shock, making the batteries suitable for tougher installation environments. Proven quality and longevity: Backed by the Mighty Max name, these GEL batteries offer improved discharge characteristics, enhanced safety, consistent performance, and an extended useful life compared with conventional designs.