07 WR 450 dead battery-backfiring

I have a dead battery on my WR and have been kicking it to start it for a month or so. I think I killed the battery in the spring as the bike was hard to start in the cold. A battery tender wont keep it charged either. Yesterday I was riding, and it was a long slow descent (low revs, no charge to the battery?) and the bike started regularly backfiring, then it just died. Does anyone know if this can just be a result of a fubared battery, or is it something different. Bike would not start at the end of the ride.:thumbsup:

rode my 250 with a dead battery for a year.it's only there for starting her up.

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