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How to Connect Batteries in Parallel?

1 Answers

WilliamLee

07/29/25 11:40pm

How to connect batteries in parallel: First, clearly identify the positive and negative terminals of both batteries. If you need to connect them in parallel, connect the positive terminals of both batteries together, and then connect the negative terminals together. This achieves the parallel connection of the two batteries. The characteristics of parallel-connected lithium batteries are: voltage remains unchanged, internal resistance is reduced, the battery capacity is the sum of the two batteries, and the power supply time is extended. The core content of parallel charging is the magnitude of the parallel current and its effect. According to parallel circuit theory, the current in the main circuit equals the sum of the currents in the individual branches. Therefore, to achieve the same charging efficiency as a single battery, the charging current should be the sum of the currents of the n lithium batteries combined into the battery pack. According to Ohm's Law formula I=U/R, this design is reasonable. However, the internal resistance of parallel-connected batteries also changes. According to the parallel internal resistance formula, the total internal resistance of two parallel-connected lithium batteries equals the product of their internal resistances divided by the sum of their internal resistances. It decreases as the number of parallel batteries increases. Therefore, it is possible to achieve efficient parallel charging of lithium batteries with a current less than the sum of the currents of n parallel-connected lithium batteries.

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