My battery is a year old and it is the 14Ah Polaris battery in my Sportsman 550. Twice now the battery has been completely flat dead. Last week it was sitting with the key off for about 5 days and didn’t even make clicking noise. If I boost the bike, it runs totally fine for a few more weeks.

On friday I took the battery out. I brought it to the dealer and the voltage was 11.7 and it tested "needs charge" and the dealer charged it and used a polaris tester and it tested "good battery" after charging for a few hours

It was charged to 12.7v and I out it back in the bike.

Two days later, I checked the voltage before starting the bike and it was 11.8v. The bike did turn over fine and it started charging at 14v pretty quick.

I tested the amperage drain on the battery with the bike off and I got the following:

Big red cable going to starter = 0
Big red cable that goes to ECU = 0
Big red winch cable = 0
Red cable with 5 wires in it that go into harness = 260
The range on the multimeter was "2000u"

I’m not sure if that drain is normal/high/low

I have a funny feeling my battery is toast.

What is the best battery replacement? Heard I could use a 20Ah battery