7 Battery
This chapter provides information about the battery, the battery types, charging/discharging, battery cold start, safety,
installation and maintenance information, battery protection function, and the connection of BCB cabinet (option), battery
temperature sensor (option), and battery ground fault detector.
7.1 Battery Types
Several kinds of batteries are available for APM2 UPS:
1. Lead-acid valve-regulated battery
2. High discharge rate lead-acid valve-regulated battery
3. Flooded battery
4. Ni-Cd (simulation test)
5. Li-ion battery
The standard configuration mainly includes lead-acid valve-regulated modular batteries and lithium battery modules.
7.1.1 Charging/discharging management
1. Constant current boost charge
Adopt the constant current (within battery charging limit) to charge the battery. This function can be used for
fast recovery of battery capacity. The charge current can be set.
2. Constant voltage boost charge
Adopt the constant voltage to charge the battery. This function can be used for fast recovery of battery capacity.
For VRLA batteries, the maximum boost charge voltage should not exceed 2.4 V/cell.
3. Float charge
This charging method is used to keep battery in full capacity. This function can balance the capacity loss due to
battery self discharge, and can be used for battery capacity recovery.
For VRLA batteries, the float charge voltage should be between 2.2 V/cell and 2.3 V/cell. There is no floating
charge voltage when the lithium battery module is charged, and when it is normally charged to the 4.10 V cut-off
voltage, the charging current is 0 A, and it enters the backup power mode.
4. Automatic transfer to float charge
When the charge current is less than 'Threshold of Equalize Charge to Float Charge' or 0.5 A, the charger will
automatically transfer from boost charge to float charge. When boost charge time exceeds the limit of 'Equalize
Charge Protect Time Limit', the charger will be forcibly transferred to float charge for protecting the battery.
5. Float charge temperature compensation (optional)
This function must be used together with the battery temperature detection device. The Vertiv battery
temperature sensor is a standard option for your selection.
7 Battery Proprietary and Confidential ©2023 Vertiv Group Corp. 123
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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