Originally Posted by nephi007
Hello. I ave 2 maintenance free Centenial marine batteries Side by side on my 2016 Shasta 25rs. Can I use I charger to trickle both batteries at the same time or do I need to buy another trickler for the other batter. Thanks
You can use one trickle or other charger for both batteries. It would work best if both batteries are the same make, model, and age. Yours are likely the same and will work fine together.
I assume the batteries are AGM maintenance free. Check the voltage at the battery terminals. The voltage should be about 13.6 volts or less. More than that may cause the batteries to vent. Venting is permanent damage. 13.3 is a better maintainer voltage for AGM's. Less than 12.7 means the maintainer is not enough or is not working properly.
Accurate digital voltmeters are cheap. You can usually get one for about $15 at a local hardware store.
You can often store AGM batteries disconnected for 12 months. Keep the battery terminal voltage above 12.4 volts. Recharge for 14 to 18 hours if necessary. (Yes, it takes that long to fully recharge lead acid batteries regardless of their state of charge. It is the way the lead acid chemistry works.)
My pair of AGM batteries hold voltage at 13.0 volts for months when disconnected.
I wish you good luck and happy trails ahead!