Theoretically, the lead-acid batteries for automobiles can be used in parallel, but due to the individual differences, service life and other factors of the batteries, it is not easy to balance the batteries, which will affect the service life. Moreover, if a single battery has a short circuit fault in use, it will quickly burn the connecting wires and battery poles outside the battery, and even cause fire and explosion. Therefore, it is not recommended to use batteries in parallel in practice. The cycle times of normal battery are 500~1000 times
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