New OBC now charger won't shut off

[cjpenny89]

I put a new OBC in my 2001 48v series cart and un-hooked the bypass and the cart ran like it should and the solenoid didn't click like crazy like before o bypassed it. We ran the cart for 15 mins or so then I put it on the charger and it started charging. I cut grass for an hour and meter was down then after 2 to 2-1/2 hours meter was just above zero and still charging. I tested pack and it was reading 64.4 volts and I could here batteries bubbling. I unplugged the charger. I know the batteries are good and I know the charger is good I use it on my 1998 cart all the time. What is wrong? Does the obc need to have a learning curve? Or did I need to set it up when I installed it? Thanks