APC UPS DLA1500RM2U

[anario_apc]

This was originally posted on APC forums on 3/27/2015

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Hi all,

after when  i replaced batteries my upc doesn't work, only red light flash behind. Could you tell me what does it mean red light?

[Terry_Kennedy_apc · Accepted solution]

This was originally posted on APC forums on 3/29/2015

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Did you replace it with a genuine Dell or APC battery pack, or one of the aftermarket ones that say "you need to re-use your original cables and hardware"? If you replaced just the batteries themselves (as opposed to the complete RBC battery pack) you may have mis-wired something. That's one of the reasons (the other being no control over 3rd-party replacements) that APC recommends using official RBC packs.

If this is a genuine Dell or APC pack, did you remember to plug the battery cable fully into the UPS? On your UPS, this is probably a big yellow plug.