Electric car battery failure in the form of a thermal runaway due to the charging voltage is too high, the current is too large, causing the battery temperature, and finally to the battery deformation, cracking and failure. 2, corrosion under normal circumstances negative bus, bus no corrosion problems, but in VRLA batteries when establishing oxygen cycle, the battery substantially fill the upper space oxygen, electrolyte separator may also lug along climbed on the bus, the bus of the alloy will be oxidized to produce lead sulfate, child car battery 6v10ah, if the bus electrode alloy inappropriate choice, child car battery 6v12, impurities and crannies, child car battery 6v4.5ah, corrosion Along these gaps will deepen, child car battery, resulting in very ears and bus disengaged negative plate failure. 3, membrane perforation caused by short circuit of individual species diaphragm aperture greater use may cause big hole, the active substance can pass through the large hole in the charge and discharge process, resulting in micro-short circuit, the battery failure. Above content provided by Hebei Tianyi Electric Co., Ltd., we hope to help a friend in the same industry. After the battery will be fully charged lead-acid electric vehicles what signs 1. Using a fully charged flag charging constant current method: the late charge density of the electrolyte continuously for more than three hours remain stable. ? Charge continuously for more than three hours late voltage stable. ? A strong electrolyte inside the bubble, was boiling. ? The charged capacity of not less than the rated capacity of 3.4-3.6 times C10. 2. With fully charged when charging low voltage constant voltage method Flags: charging late electrolyte density continuously for more than three hours late charge current is constant and stable between 0.001-0.003C10A, and continuous long remain unchanged (4-5h) Above content provided by Hebei Tianyi Electric Co., Ltd., we hope to help a friend in the same industry. Child car battery _ _ Creative resistant cell battery 6v10ah buggies provided by the Hebei Tianyi Electric Co. Hebei Tianyi Electric Co., Ltd. (www.tianyidq.com) quality of service and products, continue to receive the recognition and trust of new and old customers and the industry. Our company is a certified member of the whole alliance network operators, business alliance customer service icon on the page, you can talk directly with our customer service staff, to our future cooperation happy!