Browse FAQs
Can I mix old and new batteries in a Smart-UPS?
Published date:
18 June 2019
Browse FAQs
Issue:
Can I mix old and new batteries in a Smart-UPS?
Product Line:
Smart-UPS, Smart-UPS Online
Environment:
All models, All Serial Numbers
Cause:
Many Smart-UPS have either multiple internal battery cartridges and/or the ability to add external batteries.
Resolution:
No, you should not mix old and new battery cartridges within the same Smart-UPS system.
As VRLA (Valve Regulated Lead Acid) batteries age, their capacity is reduced. Your Smart-UPS batteries are connected in parallel and all batteries are charged at the same rate. Mixing batteries of different ages can result in some batteries being under charged while others are over charged, which would lead to reduced runtime.
For detailed information on how to replace battery modules or add additional external battery packs, refer to respective user manuals
For more information on VRLA batteries, please see APC White Paper #39:
Battery Technology for Data Centers and Networking Rooms: VRLA Reliability and Safety