Battery Replacement: DEC740 / DEC750 (Netboard A10 Gen3)

Started by proformap, June 01, 2026, 08:57:16 PM

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June 01, 2026, 08:57:16 PM
Hi there, does anyone happen to know the exact type of the RTC/CMOS battery for DEC740 / DEC750 (Netboard A10 Gen3)?
June 01, 2026, 09:13:49 PM #1
Probably a CR2032 but take a look. It is etched on it for sure.
June 01, 2026, 09:22:51 PM #2
It looks like an LR44 - not certain though.

The problem is that now — about two years after buying the new DEC740 — the battery has completely disintegrated ... black pieces of material, with only the top metal cap remaining. The metal battery holder on the PCB has also partially detached on one side.

I've never seen anything like this in hardware before ... I'm asking myself what could have caused the battery to degrade like this after just two years ... I can't explain it.
June 01, 2026, 09:48:47 PM #3
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Today at 01:35:26 AM #4
Confirming LR44, I changed one as well.
Today at 12:54:25 PM #5
�Few pictures
Today at 12:55:01 PM #6
#2
Today at 12:55:59 PM #7 Last Edit: Today at 07:39:59 PM by proformap
Battery LR44 ... well the remaining part
Today at 01:01:39 PM #8
Your main board definitely calls for someone with a soldering iron and the matching skills.
Deciso DEC750
People who think they know everything are a great annoyance to those of us who do. (Isaac Asimov)
Today at 01:08:25 PM #9
as a current owner.  wow that is kinda crazy
DEC740 > USW-Pro-8-PoE> U6-Enterprise
Dec670. Retired / backup device
Today at 07:36:55 PM #10
Quote from: DEC740airp414user on Today at 01:08:25 PMwow that is kinda crazy

Crazy - indeed.

There must have been something really weird going on with the LR44 - leakage, short circuit or something of that nature, which resulted in disintegration / bulging, pulling the metal bracket off the PCB ... just speculating.

Good news is that soldering the bracket worked and for now the DEC740 seems to work fine.
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