What precautions should be taken when using batteries in series/parallel?

When using batteries in series/parallel configurations, it is important to consider the following:

1. Do not connect batteries of different ages, brands, or capacities in series for charging or discharging.

2. Avoid discharging individual batteries separately; charge and discharge them together in series.

3. Pay attention to voltage differences between circuits when connecting batteries in parallel.

4. Do not parallel charge or discharge batteries if there are significant voltage differences between circuits.

5. Ensure environmental consistency to maintain similar conditions for all batteries.