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1) What is a valve regulated maintenance free lead-acid battery?

The basic characteristic of the maintenance-free lead-acid battery is free of maintenance , which is defined to be compared with the traditional flooded batteries, it needs regular maintenance and sulfuric acid storage battery, such as UPS battery, is without adding acid and water during its working, and batteries are sealed, there is no possiblility of acid leakage or acid mist, especially, there are one-way safety valves , when pressure of gas exceeds a exact value, the valve opens automatically and outgoing gas, and then shut down automatically, the safety valve is sealed in normal condition.

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