NPP蓄电池并联放电时:新旧电池组放电电流失去平衡，新电池组提供“大电流”，而旧电池提供“小电流或无电流或负值电流”，因而使新电池组导线发热发烫，加速导线老化，新电池过放电加速新电池老化，易导致电池漏液，更严重些引发明火。

　　耐普蓄电池并联充电时: 由于旧电池组内阻相对大，本来要给多组均分的充电电流这时基本全部加载在内阻小的新电池组上，导致旧电池组充电不足，而新电池组过充电，激发电池内部非正常化学反应，从而不但会损坏电池本身，还可能会损坏充电器/整流器，这里即是损坏LPS。

　　耐普蓄电池串联放电时:由于新电池的容量比旧电池的容量大，在放电时容易造成旧电池过量放电，严重会造成旧电池反极，从而引发事故。

NPP parallel discharge battery: when the old and new battery discharge current out of balance, the new battery pack with high current, old batteries to provide a "little or no current or negative current", so that the new battery wire hot hot, accelerate the wire aging, new battery over discharge speed up cell ageing, easy cause battery leakage, more serious cause fire.

Knapp battery charged parallel: because the old battery internal resistance is relatively large, would have to divide groups all the charging current when the basic load on the new battery internal resistance small, lead to the old battery is insufficient, and the new battery charging, stimulate cell internal abnormal chemical reactions, which will not only damage the battery itself, may also damage the charger/rectifier, there is damage to LPS.

When the battery is discharged in series: because the capacity of the new battery is larger than the capacity of the old battery, it is easy to cause excessive discharge of the old battery when discharging, which will seriously cause the old battery to reverse the pole, thus causing accidents.