2005-2009 Kawasaki Brute Force 650/KVF 650 4x4 Service Manual, Page 400Get this manual
ELECTRICAL SYSTEM 17-21 Battery
CAUTION
This battery is designed to sustain no unusual deterioration if refresh-charged according to the method specified aboveHowever, the battery's performance may be reduced noticeably if charged under conditions other than given aboveNever remove the seal caps during refresh chargeIf by chance an excessive amount of gas is generated due to overcharging, the safety valve operates to keep the battery safe
3} When you do not use the motorcycle for months Give refresh charge before you store the motorcycle and store it with the negative lead removed Give refresh charge once month during storage4} Battery life If the battery will not start the engine even after several refresh charges, the battery has exceeded its useful lifeReplace it(Provided, however, the vehicle's starting system has no problem
WARNING