1. Umthamo omkhulu webhethri ye-lithium ukuvikelwa kwebhethri okuphansi, esebenza ngaphezu kwezinsuku ezi-3 ngemuva kokushajwa ngokugcwele.
2. Ukushintsha okukabili ngesibani esisebenzayo esibonisa
3. Idizayini yokuzimela yesekethe ephezulu/ephansi
4. Okuthunyelwe okuqinile kukugcina usebangeni eliphephile