Honestly, you should replace the battery and thoroughly check out your charging system. Batteries just don't go dry on their own. Either it has a leak in the case, wasn't filled properly when you bought it, or your charging system is over-charging the battery causing the electrolite to boil off. If you have had issues with it from the start, I would just go ahead and replace it. These smaller lead-acid batteries aren't as durable as larger ones, like car batteries. Once they start showing problems (like not holding a charge), chances are the damage is done and it will never be right.
2009 outlaw 525S Rath +3 Rear Hubs, PEP Shocks (built by Rath), Flexx bars, Hiper Wheels, Razr 2 Tires, Pro Armor Kill Switch, Trail Tech Dash and Vapor Computer, HMF Exhaust,Rath Nerfs and PRM Bumper/Grab Bars... more pending $$$ 2005 Pred Twin Air clamp-on, Edelbrock, Rath A-arms, Dyna FS, P&P cylinder head (Nicholas Cycle), Rath Head Pipe, Yoshimura slip-on, Pro Armor nerfs, JE 12.5:1 Piston, Trail Tech Dash and Endurance Computer, Home made radiator scoops and chassis skid, PRM Bumper and Grab Bar, 5hp sticker removal, and many custom scratches and minor cracks!!