Battery immediately drops from 100 to 90% when discharging

Anonymous user · ‎2021-06-28

Hi,

I've bought a brand new Back-UPS BX950UI and I'm experiencing this issue: the UPS has battery level at 100% but, when the power goes off, it immediately (in a matter of 5-6 seconds, as reported by Powerchute) drops to 90%. After this sudden drop, it start discharging with a normal rate.

I'd like to ask: is this a sign of a defective battery?

Thanks,

Alessandro

MarkC_apc · ‎2021-06-28

My experience has been that the "Smart UPS" lines of SU/SUA/SUM (no LCD) will drop the first LED very quickly. When monitering with a NMC, the % drop initially is usually quite large also. The SMX line with the LCD seems to be more accurate (?) in that similar loads seem to drop the battery % much more linear. The ultimate test of your battery array is to compare to the load curves of your unit (run times before battery depletion vrs load).

See Answer In Context

MarkC_apc · ‎2021-06-28

My experience has been that the "Smart UPS" lines of SU/SUA/SUM (no LCD) will drop the first LED very quickly. When monitering with a NMC, the % drop initially is usually quite large also. The SMX line with the LCD seems to be more accurate (?) in that similar loads seem to drop the battery % much more linear. The ultimate test of your battery array is to compare to the load curves of your unit (run times before battery depletion vrs load).