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Ordinary lithium iron phosphate - LiFePO4 batteries will face many problems when charging at -20 degrees Celsius, it is usually not recommended to charge directly, and some specially designed and improved low-temperature lithium iron phosphate batteries can be charged at -20 degrees, the specific analysis is as follows:

After invented more than 100 years, the lead acid battery was developed by very mature technology and application with AGM, EFB etc as maintenance free and all sealed without fluid leakage.

All HEV battery machine operator should be aware and understand of the key difference between NiMH battery 4 cycles repairing and reconditioning, because different steps represent different function and purpose to repair the cells back to normal.