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Features: Wider Temperature Range -40℃~+80℃. Lighter Weight Only 40% lighter than comparable lead-acid batteries. Longer Cycle Life 4X longer life,20 times longer cycle life than lead-acid batteries,reducing user costs. Higher Power: Delivers over 500-amps of starting power, over 50,000 starts, and over 2,000 charge cycles,meaning: it has 2X more power and 10X more starts. Superior Safety The electrochemical performance of sodium-ion batteries is relatively stable, and it is safer than lithium-ion batteries in use.Moreover sodium batteries can work normally in the temperature range of -40℃ to 80C,and the capacity retention rate is close to 90% in the environment of -20℃,and the high and low temperature performance is better than that of other secondary batteries.