hmmmm. tab etkhabes keda w ro7 e3mel nafsak hateshtere batareya maintenance-free, hay2esolak sha7n edenamo bebalash, aw ya sede ro7 le ay kahraba2e we khaleh ye2eslak sha7n el denamo wedelo ay 7aga, asl en elbatareya tfor lama tdos banzin de 3shan elmaya zyada fil batareya mesh dakhla dma'3e