Upgraded to Lithium so I have three Duracell Ultra Platinum AGM's 27M size. Three years old still strong when replaced $100.00 for all three. Plus will give you a 2X Power cranking battery Free. NAPA load test said replace battery but it still cranked my 250 merc. fine. Also, Duel Pro 4 bank SS4 model charger 10 amps per bank 40 amp charger $150.00. Cash & Carry Local Pickup