Battery Charging

[Big O]

Big O

I have a 2 bank charger and charged both batteries one day. Then 3 days after that was done I hooked charger back up and one of the banks stayed green but the other was charging (showing red). After the the one that needed charging again was charged I unhooked charger. 2 days after that I rehooked charger and the one that needed charging stayed green but the other one that was charged before needed charging again? Really confused about this. Batteries were new last year in June. Help!!!

[Lund AnglerMJ]

Check battery connection's and the voltage of both.Make sure they're both close to the same voltage. Next,look at the water level's of each.Try and charge them 1 at a time,and see if that help's.1 battery may be bad,or a connection may be the culprit.Clean them with baking soda,and dry them off,and if you're charger has different cell type charge mode's,check them.My Minn Kota 220 has some different setting's to charge different batteries.Gell cell's or Maintenence free type or Lead calcium type's,all require a different setting.Good luck.1 battery with 1 cell bad, can gum up the entire operation.