I have bought 2013 toyota fj cruiser. After I used my car for battery to battery via cable my battery gage went down. When I start engine the battery gage indicator erratically goes down. Compare with the time I bought the car the battery indicator stays a bit lower. Is it a serious problem?
p.S. At the time we tried to battery to battery via cable to recover the other car battery, my car power went unstable with a weird sound like chick chick chick.