Simply put, parallel charging batteries allow the user to charge multiple batteries at once, which provides longer battery life and increased reliability for the user. Figure 1 provides a basic description of series and parallel battery configurations that are commonly used. Figure 1. Series and parallel battery configuration.
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.
Now that longer battery life is such a critical factor for consumer devices, manufacturers need to become creative with the ways they conserve and extend a battery pack’s useful capacity. The best way to implement a simple solution for longer battery life is to have parallel charging.
Parallel Charging Your LiPo Batteries. Since the individual cells of each battery are also in parallel with the individual cells of all the rest of the batteries, when the balance leads are connected in parallel (by plugging them all into a parallel charge board), all of the strings of cells in parallel will also equalize to the same voltage.
Some of the benefits of using this chip are minimizing dropout and heat, preventing cross-charging for parallel batteries, and being able to independently charge parallel packs. This article has pointed out some of the benefits and drawbacks and given us an introduction to the combination of parallel battery charging and USB-C.
The basic concept is that when connecting in parallel, you add the amp hour ratings of the batteries together, but the voltage remains the same. For example: two 6 volt 4.5 Ah batteries wired in parallel are capable of providing 6 volt 9 amp hours (4.5 Ah + 4.5 Ah).