Batteries linked in series cannot be charged in the same way as batteries linked in parallel and different numbers of batteries may require different types of charger. It sounds like your batteries are different in each of those ways.
Infographic Li Ion Vs Lead Acid Forklift Batteries Which
Lead acid batteries in parallel. For secondary rechargeable batteries the stronger battery would charge the weaker one draining itself and wasting energy. If you connect rechargeable batteries in parallel and one is discharged while the others are charged the charged batteries will attempt to charge the discharged battery. Or connect a group 24 with a group 27 and group 31 sized battery. With no resistance to slow this charging process the charged units can overheat as they rapidly drain and the discharged battery can overheat as it attempts to charge at well above its design. Very discharged lead acid batteries have to be charged with fixed current until they get to a minimum voltage then they can be voltage charged. With a basic understanding of the difference between series and parallel connections anyone equipped with the right battery charger can safely charge multiple lead acid batteries.
We would strongly discourage anyone from connecting batteries in series or parallel applications if the batteries are not identical in age size and type. In theory it is ok to connect them in parallel with two conditions. Balancing lead acid batteries i immediately disconnected the charger and disassembled the battery pack. Each battery must be in a state where it can be voltage charged. Wiring batteries in parallel in order to balance them. All flooded lead acid or all agm.
How battery charging works with a parallel battery bank. Can i connect my new bluetop d31m in parallel with my one year old other brand marine 29 series. They can have different capacities on account of size or age but the same chemistry eg. For example the bmpro invicta lithium batteries are capable of being installed in parallel with up to 4 batteries. We assume when you plan to connect your batteries in parallel you are using the same type age and size of batteries. For example you would not connect a deep cycle battery with a starting battery.
Not all lithium batteries are created equal especially cheaper batteries. This is fine for lead acid batteries unless they are very run down. Lets suppose you have 3 different 12v batteries wired in parallel to supply 12v power to your rv. As per good practice with lead acid setups all batteries should be of the same brand size and age. Or connect 2 old batteries with 2 brand spanking new batteries. In order to balance a battery pack composed of multiple batteries in series you need to wire them all up in parallel like this.
Check with your battery manufacturer first.
Gallery of Lead Acid Batteries In Parallel
