SU2200XL Temporary Externall Battery Setup?

[Anonymous user]

Our Smart UPS 2200XL has 2 internal batteries and an APC external case with 4 large 12v batteries. All batteries are due for replacement. However, we are moving to a new facility in about 2 months that has new UPS systems installed, so our 2200XL will not be used. Therefore, I would like to limit the costs for the 2200XL.

For that reason, I ordered 2 new internal batteries, intending to use them only until the move, with the external battery box disconnected . I realize backup run-time will be shorter. However, since this is a temporary situation, I am OK with that.

When I tried to remove the old internal batteries, I discovered they have swollen to the point that I cannot get them out of the UPS case. I have disconnected them and am now running the UPS with only the external batteries. Everybody seems happy, but, as I say, the externals are also at or near the end of their life.

So, with the old internal batteries disconnected, can I disconnect the external batteries inside their box, and connect the two internal batteries in their place. Will that work for a temporary situation? If so, does it matter which of the four connectors I use for the 2 new batteries?

Thanks in advance for your help.

-David.

[Erasmus_apc]

I don't think this is a course of action that we can support. The internal batteries are not meant to be connected either physically or electrically to the external battery system, and considering the sad state the internal batteries are already in, this could cause the swelling to become worse or escalate to a battery rupture or unit failure. If you were to do this there is also a high risk of the unit not being able to support the load at all, as this approach to a "temporary" setup is untested.

[Anonymous user · Accepted solution]

OK, thanks for the information.

I actually don't think further swelling or rupture of the old internal batteries would be a problem. Although they are still in the case, I have disconnected them, electrically, from the system. However, I can understand if, from an engineering standpoint, the new (internal) batteries won't work on the external battery system. That answers my question.