Frequently Asked Questions

About Battery

Battery pack part number starts with “BP” and your UPS model number follows (e.g., BPA11J). You can find which battery pack, and how many you need, at the URL links below.


[ Replacement Battery ]

[ Battery Locating Chart ]

Most of the lead-acid batteries in our UPS system will last 5 years, Nickel-Hydride batteries and Lithium-Ion batteries will last 10 years when the surrounding temperature is 25°C/77°F according to the respective battery manufacturers. An automatic battery health check (Default is set to every 6 months) will inspect the battery discharging voltage and will beep to notify you if it detects lower voltage than the normal.

Our UPS is also programmed to notify you with a beep when the battery needs to be replaced based on the period of the time calculated and by the surrounding temperature. The default is 4.5 years with 25°C/77°F since the initial installation. The higher the temperature, the sooner you would hear beeping and vice versa.  

The beep will be triggered by whichever comes first. (For this reason, you will need to reset the battery information when you change the internal battery pack. You can find the battery reset instruction in the product manual).

SANUPS products all have hot-swappable batteries. The cable connector and battery pack housings are designed with easy and simple maintenance in mind. Please note that the UPS systems are UL listed and CE marking products. To keep these labels, please ask our field support to replace the battery.

– Tips for replacing the battery pack –

When you change the battery, please be sure to wear insulated gloves and shoes. It is also a good idea to remove rings, necklaces, and watches. Using insulated tools is also the best practice. Please do not use a third party battery or mix up old and new batteries. Using the same battery longer than its product life may decrease the backup run time and the worst case, catch fire.

Total Battery Capacity (Ah・Cell) can be calculated by the formula below.


  Capacity (Ah) of One Battery-Pack

x Number of Cells in One Battery

x Total Number of Batteries in series

x Total Number of Batteries in parallel (Exclude this line if there is no parallel)

x Number of Charging Circuits

The lithium-ion battery has dramatically more battery-charging cycles compared to a lead-acid battery which makes the product life so much longer. Besides, Lithium-Ion batteries are small and lightweight and fit in many small electronics such as a mobile phone or laptop computer.

The power of electricity that a Lithium-Ion battery produces is powerful which means it requires a charging voltage control at the highest level. Also, Lithium-Ion batteries cost more than lead-Acid batteries because of the material it uses.

SANUPS A11K-Li finished its development and is expected to be released in early 2019.    

Lithium-Ion Batteries tend to have a complex charging circuit because it is susceptible to charging-discharging. If the voltage control is not thoroughly managed, it may result in a significant accident and this has been a big challenge to many electronics manufacturers.

Our SANUPS A11K-Li was not an exception. To overcome such a challenge, A11K-Li monitors temperature, charging ratio, and voltage information by CAN communication. With this communication, the UPS circuit and Lithium-Ion battery will be completely separated in case of over-charge, over-discharge, and short-circuit. This technology makes A11K-Li UPS safe and user-friendly.  

If you were to store the Lithium-ion battery UPS, please remember the points below.

1: Lithium-ion batteries get more impact from the environment than a lead-acid battery.

2: If the Lithium-ion battery is fully charged, it becomes progressively worse faster. In other words, Lithium-ion battery deteriorates slower when it is less charged.  

3: If a Lithium-ion battery is completely discharged, it will not be able to fully recharge.

4: A lower storing temperature is better for Lithium-ion batteries.