The battery might be fine but your connections or cables might be bad. Make sure the cable clamps are clean and have good contact with the terminal posts and are tight, but not super cranked tight. Could be the cable connection at the other end of the battery cable or the cables themselves. Check those.
Welcome to LOST. What country do you hail from, since you have a KJ Cherokee? Australia, Spain, Great Britain, France, Greece, etc...?
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New KJ Gear -
Desert Armor Flak2004 Renegade Light Khaki - 4" JBA Lift - Rock Lizard Products: Komodo Dragon Rear Bumper, Prototype Winch-mount Front Bumper, Super Skink Sliders - All J's Super Tranny Skid II - 31" Firestone Destination AT's on Moab wheels - Cobra 75W CB w/ stock Antenna mod
[b]Retired, US Military