Best Charge?

[Anonymous user]

I have this APC UPS, MADE IN INDIA BANGOLORE, MOD: SURT 2000 XLI, S/N: JS0720021614. and I quess my battery cartridge will be RBC31 ( I have not changed it yet! ). I completely discharge it nearly every 6 months convenient to the advices of APC, letting it work from the battery until the unit shuts itself down, then I start charging it. But last time, I decided to try a very different route! I let the unit shut itself down after the discharge, I waited for some time, then I applied a "cold start" to the unit! The working fans completely dried the battery and after a short time the unit shut itsef down again. At this point I started charging, and for a short time although the fans worked, the unit did not supply electricity to the connected devices! But then it started working and everything seems well since then! In your replies please note that as I do not have a RS232 port in my computer I can not communicate with the UPS! And below are my questions;
So what did I do? 🙂 And what can the consequences be? Did I without knowingly "brain dead" the UPS? Can this technique of over-discharging be harmful to the battery and the device? Can this way of discharging be adviced or is the conventional way adviced? Why did it took some time for the UPS to work again? Thanks for the help!

[Techie_apc · Accepted solution]

As far as I know, there is no big difference between the first calibration method which you described and the recent discharge what you did. Thus, there will not be any consequences due to this method of discharging. A full battery discharge will recalibrate the unit, and re-adjust the runtime if it was incorrect. However, I would not perform the calibration frequently as it may degrade the battery life.

I have seen that Smart UPS is normally will not provide power to its outlets until the battery charges up to 15% when power is restored. I guess this would be the case that the unit took some to work again when power is restored.