XS 800 mystery failure?

[Anonymous user]

Hello big brain,

I've been researching this question, but so far nothing that comes close.

I just hooked up an older XS 800 that has been offline for a few weeks-months. Last time it was used, the battery didn't have full life any more, but still had enough juice to not be replaced yet.

Now, when connecting the unit and hitting the power button, it just gives a short beep and the Replace Battery, Overload and On Battery lights light up very quickly all once after each other and in that order and then the unit doesn't do anything. The Building Wiring Fault LED is off.

After a minute or two, the unit will repeat the LED sequence when I push the power button again.

What does this indicate? Is the unit toast? Anything to try to repair myself (unit is out of warranty)?

I already checked the battery cartridge with a multimeter and it gives 0V between any of the poles (not very weird that it's empty after such a period of inactivity).

The UPS-powered outlets are not giving any output, but the surge-only outlets pass on the power.

Any advice is welcome!

[BillP · Accepted solution]

I do think there is a fault with the unit. I believe the unit should turn on without a good battery and indicate a "battery disconnect" state with a flashing replace battery. What you're seeing is not normal. These units are not serviceable but even if you wanted to proceed at your own risk, I am not even sure what would cause this...

If anyone else wants to provide any input, please do but my suggestion for now would be to consider trading the UPS in towards a new one (Recycling Options - recycle) or pursuing a replacement.

Let me know if you need any help or have further questions.

[Anonymous user]

Hello yogi,

If you left the ups unplugged (but the battery still connected) when it was not in use for several months, the battery has likely been discharged/drained and any of these type of batteries if left in a completely drained state for longer than 72 hours they start to deteriorate. The readings of 0 volts suggests the battery module (2 x 12 volt cells) is completely shot.

If a ups is not going to be used for awhile and needs to be stored, the recommended practice is to shut down the ups with the battery at 100% charge, and then completely disconnect the battery. Then you need to reconnect the battery and plug the ups in to charge the battery at least once a year (once every 6 months is better) to keep the battery healthy.

[Anonymous user]

@Angela N. & Battman: big thanks for confirming my impressions. The unit and the battery are both declared dead without any chance of reanimation.

I actually got it as a used unit last week. Luckily the seller doesn't mind taking it back after these tests.

I love the trade-in program, I didn't know about it. I noticed a 28% discount on certain units. However, new units are still out of reach for my budget. I'll keep on looking for a used unit with still some battery juice and the right price tag.