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Battery charge dropping while connected to power mains

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.

theone
Crewman
Crewman
0 Likes
4
536

Battery charge dropping while connected to power mains

I have an APC BR550GI Back-UPS ups.

 

I have fully charged a new battery with UPS turned off.

 

I then turned the UPS on and connected it to a constant load of ~60W.

UPS is still connected to AC power input.

 

After a couple of hours the battery is showing ~80% battery capacity.

 

How can this be? should the battery still be at 100% because at all times the AC input was connected?

 

This also happened to me with my previous battery - the UPS could not keep the battery charged while connected to the real load (PC). Battery would be completely drained over the course of a day although plugged into AC power.

 

Is there something wrong with the UPS?

 

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4 Replies 4
APC_Matt
Lieutenant JG Lieutenant JG
Lieutenant JG
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3
471

Re: Battery charge dropping while connected to power mains

Hi

One thing worth trying is to put the back ups on battery and let it fully discharge and then charge up again.  It may need to calibrate so it correctly shows the battery capacity.

 

Regards

 

Matt

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theone
Crewman
Crewman
0 Likes
2
464

Re: Battery charge dropping while connected to power mains

Ofcourse I tried it.

 

The problem is that the UPS only charges the battery when truned OFF.

 

I did this and still UPS drains the battery over a few days with no load connected and AC mains on.

 

I also connected the battery after draining a 2nd time to an external dedicated charger and indeed it was amlmost empty so I don't think it is a calibration issue.

 

 

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APC_Matt
Lieutenant JG Lieutenant JG
Lieutenant JG
0 Likes
1
462

Re: Battery charge dropping while connected to power mains

Hi Theone

In that case can you contact the APC Customer care team in you region and they can organise a replacement

https://www.apc.com/uk/en/support/contact-us/   

 

Just change the country at the top of the page to the appropriate one and that will give you the correct contact information

 

Regards

 

Matt

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theone
Crewman
Crewman
0 Likes
0
460

Re: Battery charge dropping while connected to power mains

Even if not under waranty anymore?

 

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