Sealed battery, sealed to prevent electrolyte spillage or loss when operating within specification. This structure will allow manipulation in any position. Gas generation within the battery is controlled to allow the recombination of more than 99% of the gas generated during normal use. These batteries are equipped with a low-pressure vent system that will release excess gas and automatically reseal if the gas pressure rises above the normal rate. While sealed batteries are generally considered safe to operate in enclosed areas, the low-pressure venting capability will still allow some gas to escape under certain conditions. Therefore, it is important to observe all the same safety precautions that must be followed when working with normal wet batteries, especially during charging. Due to the use of heavy lead calcium alloy grids, these batteries are especially suitable for UPS service where deep discharge and cycling are common.

Typically, manufacturers of sealed batteries specify a floating life of 3-5 years, depending on the depth of discharge, and over 1000 discharge and charge cycles can be expected. High temperature is the real killer of batteries. When a system is designed with an internal battery, it is best to maintain as much space as possible between the battery and high heat sources such as transformers and heat sinks for power transistors. While this is often impractical or even impossible, battery life will be maximized if the battery is kept within an operating temperature range of 20 to 25°C. This is sometimes easier to do in an SPS, where the internal ambient temperature of the enclosure may only be 7 or 8°C warmer than the external temperature, and only for short periods of time when the inverter is in service. A UPS, on the other hand, operates continuously and measures must be taken to protect the batteries from overheating. Placing the battery near the air intake instead of the exhaust, for example, improves the situation because cooler room air is pulled across the battery as it enters the electronics enclosure.

Changshu Wanlong Power Technology R&D Co., Ltd. is a lead acid battery manufacturer from China. The company sells 12v deep cycle gel batteries all year round.