If the batteries start getting excessively hot or if the lead acid battery starts gassing indicated by a hiss from the safety valve unplug and disconnect everything immediately. The first thing you need to do if you think your battery is going bad is to figure out the voltage level of the battery.

282 Best Show Us Your Optima Batteries Images In 2020
How to tell if an optima battery is bad. Also keep this process monitored. A fully charged battery typically measures at least 126 volts and a completely discharged battery typically measures somewhere below 113 volts. A broken terminal bulge or bump in the case crack or rupture of the case excessive leaking and discoloration. Its best to measure voltage directly at the terminals and most auto parts stores sell voltmeters for less than 10. There are a few things to inspect such as. Positive to positive negative to negative connect the charger to the regular battery and turn it on.
Hook the optima to the regular battery in parallel with the jumper cables. Wait and hour and check the optima. Heres how to do it. 1 inspect the battery. Of course an optima charger will jump through all these hoops for you and charge up your agm battery just fine. Once any battery is discharged below 124 volts sulfation begins to form inside the battery which diminishes both lifespan and capacity.
There are some sure ways you can tell if your battery is bad by simply taking a good look. If its hot to the touch or gassing out the vents shut it down. As we talked about the battery in the nissan i decided to run home and get my optima digital 1200 and an extension cord to try and recharge the battery.