1. free-maintenance, needn't add electrolyte in the usage period.
2. adopt high quality resistant alloy and scientific interior structure design . To achieve long service time, cycle
life reach 800-1200 times
3. adopt interior components with low resistance, high efficiency of discharge.
4. the difference of voltage between every battery is minimum
5. excellent design, high specific energy.
6. adopt spacer is made of special calcium lead to achieve least self-discharging