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From: Jeff Liebermann <jeffl@cruzio.com>
Newsgroups: sci.electronics.repair
Subject: Re: Tripp Lite BCPERS450 UPS
Date: Mon, 19 May 2025 17:56:32 -0700
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On Sun, 18 May 2025 22:04:30 +1200, Ed.Vance@f10.n1.z11969.fidonet.org
(Ed Vance) wrote:

<https://tripplite.eaton.com/bc-personal-120v-450va-280w-standby-ups-tower-usb-port-3-outlets~BCPERS450>

>The UPS has always been plugged in a A.C.  outlet but one day I presses the
>Power On button and it didn't come on.
>Would replacing the Battery correct this problem?
>Once, years ago I replaced its Battery.

DOes the 115VAC input have power?
Did you check the UPS fuses?

How many years?  Batteries don't last forever.  The Gel or AGM
batteries used in such USP's typically last about 5 years before they
begin to deteriorate.  Testing the existing battery before replacing
is cheaper than buying a new battery and discovering that the problem
is elsewhere.  This might help:
"How to Tell If a GEL Battery Is Bad and How to Test GEL Batteries?"
<https://www.renogy.com/learning-center/solar-battery-troubleshoot-maintain/gel-battery>

Bulging electrolytic capacitors can also mimic the same symptoms.  The
unit works fine for years.  Then one day, it loses power and won't
turn back on again.  Look for electrolytic capacitors with bulging
aluminum tops, blown out rubber seal near where the leads come out, or
leaking electrolyte from somewhere:
<https://www.google.com/search?q=bulging%20capacitors&udm=2>
An ESR (equivalent series resistance) meter might be useful for
testing the caps.


-- 
Jeff Liebermann                 jeffl@cruzio.com
PO Box 272      http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann      AE6KS    831-336-2558