Not my battery. It just shows what the inside of a battery looks like.
The Hailong 52 volt x 17.5 Ah (nominal) is composed of 70 cells. They are configured into 14 groups (connected in series) of 5 cells (connected in parallel) - written as 14s5p.
Should one cell behave badly i.e. discharges too quickly, it will suffer premature voltage sag and trigger the BMS to shut down the entire battery.
The net effect of this is that the rest of the cells still hold some charge but you cannot access it.
A further effect is that a cell that discharges too quickly will also charge too quickly. The defective cell reaches its peak voltage before the rest of the other cells resulting in them being undercharged.
The bottom line is poor battery performance showed by last night's test. There is a cure but tearing the battery apart to find the deviant cell is too time consuming and, therefore, too costly.
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