Constant Pressure limiting charge ：
　　VRLA batteries for the VRLA battery charging method is the best method of charging. Control the battery charging voltage and temperature and the use of the method.
　　Stand-alone charging the battery : 2.23 ~2.30/, was at 25 ℃
　　Georgia : 2.40~2.50/ single rechargeable battery recycling, at 25 ℃.

　　Note : The current general to the greatest start charging less than 0.4CA

　　Five - or six plans for charging the battery curve, we can see from the map. at 25 ° C when the battery voltage under 2.30V/ Single-frame, full battery power, 0.5~4mA/AH charging current decline, remain unchanged.
　　When charging the battery for 2.4V/ Single-frame, full battery power, the charge current decline 3~10MA/AH. remain unchanged.

　　Constant current charging :
　　The method used for charging the battery, attention must immediately cut off rechargeable batteries with electricity supply. otherwise it will create too rechargeable battery, battery and damage to property and life, using constant current charging. Current 0.1CA not exceed recharge. When consumption reached on a rechargeable battery discharge volume 1.07~1.15 times, the battery is sufficient to power.

　　3.2.2 Temperature to charging the battery voltage :
　　As with the rise of temperature and accelerate chemical reactions, with the decrease of temperature and slows down.
　　To prevent the battery fully sufficient or deficient, not when the battery temperature 15 ° C to 35 ° C, required for charging the battery voltage adjustment.
　　
　　Adjustment for :
　　To 25 ° C as the basis for the voltage adjustment factor : +3MV/ ℃ Single-frame l (batteries); Single-frame l +4MV/ ° C (cycle battery)
　　
　　 For example : 8 12V65AH use of a UPS battery backup so that when the battery room temperature of 40 ° C in summer. then charging voltage should be downgraded from 8 × 6 × 2.30=110.40 ：

　　8*6*[2.30-3(40-25)/1000]=108.24V

　　Room temperature 10 degrees lower in winter when the battery, then recharge voltage should be raised to : 110.40V

　　8*6*[2.30＋3(25-10)/1000]=112.56V

　　(Chart 7) for charging the battery voltage and temperature curves 。

　　 3.2.3 Recharging time : 　　
　　 Speaking on standby batteries, battery, battery re-charging for the time needed, normally no less than 24H. Used batteries for recycling are concerned, if the discharge capacity and know that the last initial charge current. can be calculated by the following formula needs an ambient temperature of 25 ° C in the recharging time.
　　A、When the discharge current is greater than when 0.25CA ，

　　Tch = Cdis/I + 3~5

　　B、When the discharge current of less than when 0.25CA ，

　　Tch = Cdis/I + 6~10

　　Note : Tch -- with the battery charging time (H)
　　　　   Cdis a battery discharge capacity (AH)
　　　　   I largest initial charge current (A)