SURT6000XL low battery runtime warning after calibration

[denywinarto_apc]

So the other day when blackout happened the ups throw me this error : 

UPS: The battery power is too low to support the load; if power fails, the UPS will be shut down immediately. 

And it wont sustain the load, which is strange cause the load isn't even 10% on the readings 

So i replace the battery with apc official battery, i tested all of them with before installing to make sure it's brand new. 

but the same error happens again after i run the calibration (after the battery is 100%) 

Any ideas?

UPS

Firmware Revision

452.18.W

NMC is AP9631

Application Module v6.4.0

APC OS (AOS) v6.40

APC Boot Monitor Version v1.0.8

[denywinarto_apc · Accepted solution]

Update : Finally solved this issue ! I followed this guide

https://www.stevenjordan.net/2016/05/fix-early-ups-shutdowns.html?m=1

After setting the constant to FF, the runtime says 8hrs 26 min, should've done this right after i bought it.

But how often do i need to do this though?

Another question for apc team, is the hard calibration absolutely necessary or not after resetting constant?

Since constant reset doesnt work with nmc installed, i need to remove nmc before running it,

But I read from various forum posts that the NMC card is hot-swappable, so that means when i need to calibrate i could just unplug the nmc and reset the battery constant.

So if hard callibration is not neccesary it's much simpler if it's not and i dont mind doing it once-twice a year.