Built for larger vessels and higher power demands, the Millertech 12V 135AH Heated Dual Purpose Starting Battery pairs superior capacity with advanced heating technology for worry-free cold-weather starts. The integrated heater automatically engages at 32°F, using charger power to raise the battery to 34°F, ensuring optimal charging and performance. Its durable, sealed design withstands tough marine environments, while Bluetooth connectivity makes monitoring simple. With extended run time, dependable starting power, and a 10-year full coverage warranty, this battery is a long-lasting upgrade for serious boaters.