1. Ukuvikelwa kwebhethri le-lithium elinomthamo omkhulu, okusebenza izinsuku ezingaphezu kwezi-3 ngemuva kokushajwa ngokugcwele.
2. Iswishi ephindwe kabili enesibani esibonisa ukusebenza
3. Umklamo ozimele wesekethe ye-voltage ephezulu/ephansi
4. Iposi eliqinile likugcina usekude