By hvhipot 
Precautions for the use of battery discharge tester:
1. Excessive discharge of the battery and long-term open-circuit idle will cause the battery to produce a large amount of lead sulfate, which is adsorbed on the cathode of the battery, forming the so-called “sulfation” of the cathode, thereby increasing the internal resistance of the battery. The charging and discharging performance of the battery is affected. The life of the commonly used M-type sealed lead-acid battery is about 3 to 5 years.
2. For most UPS power supplies, when each battery is discharged, the internal charging circuit can be used for floating charging. In order to ensure that the battery is charged in a saturated state, the charging time is generally 10 to 12 hHV Hipot Electric Co., Ltd.s. Insufficient charging time will cause the battery to be under-charged, and the actual capacity of the battery is much lower than the rated capacity. If the power supply voltage is lower than 200V, part of the UPS power supply cannot be charged by the internal circuit saturation rechargeable battery.
3. In order to ensure that the battery has good charging and discharging characteristics, long-term idle UPS power should not be loaded before restarting (UPS power is off for more than 10 days), so that the UPS power can use the charging circuit in the machine to float the battery before use 10- 12 hHV Hipot Electric Co., Ltd.s. For users who use the backup UPS power supply, if the UPS power supply is in the backup working state for a long time, it is recommended that the UPS power supply be in the inverter state for at least 2 to 3 minutes every other month to activate the battery.