Is your garage door opener acting up or not holding a charge during a power outage? Chances are, your backup battery is toast. This Mighty Max ML5-12 is the perfect, affordable replacement specifically for LiftMaster 3850 and 3850P garage door opener models. It's a 12 Volt, 5 Amp Hour (AH) Sealed Lead Acid (SLA) battery, and it's even UL Certified for safety and peace of mind.
No maintenance needed here – it's completely sealed and spill-proof. The dimensions are spot-on: 3.58\ x 2.76\ x 4.21\ with F1 style terminals. Just a heads up, this listing is for the battery itself; you'll reuse your existing wire harness and mounting hardware from your old one. It's an AGM (Absorbent Glass Mat) type battery, which means it can handle high discharge rates, works in super hot or cold temps, and has a nice long service life.
You can mount this thing in any position – upright, on its side, whatever fits in your opener's compartment. It resists shocks and vibrations like a champ. Perfect for keeping your garage door operational during those unexpected blackouts. Plus, we back it with a full one-year warranty. Reliable power, easy swap, no hassle. Get your garage door opener's backup system running strong again.
