The 16.8V electric drill lithium battery protection board disassembled the 16.8V battery and found that among the 4 strings of cells, the voltage of the first two and last two cells was of 4.1 V and that of the two middle cells was only 3.5 V. As a result, the light turned green quickly during charging and the usage time was very short! After charging the cells separately, they all reached 4.1V and the power was sufficient... The 16.8V electric drill lithium battery protection board opened the 16.8V battery and found that among the 4 strings of cells, the first and last two cells had a voltage of 4.1V. The middle two only have 3.5V, causing the light to quickly turn green while charging , and the duration of use is very short! After charging the batteries separately, the batteries reached 4.1V and the ppower was sufficient. After reassembling it, will there be a voltage difference during use? What causes the voltage difference in the battery cells?
This type of simple protection card has no balance, so it is easy to have symptoms of capacity decline. In fact, after the appearance of a voltage difference, the voltage of individual cells is high, overload protection is provided. the protection panel is activated and the charger simply turns on the light.
1. The full voltage of the lithium battery is 12.6 V. Your charger only has 12 V, so the battery is not fully charged.
2. The lithium battery charging method is constant current and constant voltage charging. Generally, non-lithium batteries do not have this function. 1. For batteries simply connected in parallel, it is not necessary to use a protection boardcombined operation. Just connect a 3.6V protection board which can be used with high current (because the conventional protection board limits overcurrent and multiple parallel batteries require high current, so it is necessary to pay attention to this) 2. If a battery in the parallel line is defective