Ups modual mains switch V drop

[T-Grizzly]

Pi powered via UPS modual when I switch from mains to battery their is a voltage drop just large enough to power down the pi is it possible to even this out with a few capacitors or would I need a better ups module?

[neilgl]

What UPS module is it?
I’m using an APC Back-UPS 700 to power a pi4 and the fibre modem and a router - seems to work ok.

[neilgl]

See also this ups post https://forums.raspberrypi.com/viewtopic.php?t=342242

[MarkDH102]

I have this model of APC Back UPS

BE850G2-UK

I too run a Vodafone modem and fibre box plus a Pi3 running PiHole.
We have many power cuts. Ranging from 1s or less up to 6 hours.
I've never had any of the equipment drop out.
The only thing I will say, is that I only get 1 hour of use from the backup which I think is poor for a 850VA system.

[memjr]

Get a proper computer UPS. USP modules "made for the Pi" are just an expensive joke/crap.