Q&A

A: Yes, it is necessary for lithium battery. Since lithium battery is hazardous goods and may cause leakage or fire if misused. PCM and BMS is a necessary method to protect the battery from over-charge, over-discharge, over-current, over-temperature and short circuit. BMS also has functions of SOC(state of charge), SOH(state of health), communication and LCD screen etc.

A: Short circuit or open circuit of the connector or wrong connection, desoldering or cold solder joint between the batteries and lead, wrong connection between the batteries. 

A: The battery is zero voltage or there is battery with zero voltage in the battery pack. 

There is wrong connection inside the battery pack. 

There is abnormity of electronic components and/or PCB inside the battery pack. 

There is failure in charger. 

Outer element causes the charging efficiency to be too low, such as extremely low or high temperature.

A: If the batteries with different capacity or new and old batteries are used together, leakage, zero voltage and so on might happen. If the batteries are rechargeable and are being charged, some batteries is overcharged and other batteries is not in full charged state. During the discharge, some batteries can not discharge fully and other batteries might over discharge. This way, the battery will be damaged.

A: If different types of batteries are used together, or new batteries are used with old ones, the difference in characteristics of voltage, capacity, etc , may cause over-discharge of the battery which is exhausted first, leading to swelling, bursting or fire.

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