Products > Test Equipment
using 3x CR2032 to power a fluke 77 series meter
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BeBuLamar:
The 77 is rated for 2000 hrs of battery life. So whether using 9V Lithium or 9V NiMH for the reason to prevent alkaline leakage is fine. But the cost of battery is nothing. I wouldn't bother to build a pack out of 3 CR2032's.
edavid:

--- Quote from: AVGresponding on October 19, 2023, 04:44:14 pm ---
--- Quote from: bdunham7 on October 19, 2023, 01:51:07 pm ---Just use an EBL 6F22 lithium battery, rechargeable or primary.  Coin cells don't sound very efficient, although it's true that type of meter doesn't exactly draw much current.

https://www.eblofficial.com/products/9v-batteries-with-battery-charger

--- End quote ---


EBL, Znter, am currently trying the brand "PUJIMAX" in one of my DMMs, seems fine. Only issue you get with these is they give a constant voltage until the internal cell is empty then just stop, so you don't get a low battery warning.

These are quite a bit less than a tenner these days, I see no good reason to use anything alse (in most use cases, YMMV).

--- End quote ---

It sounds like you are talking about the USB chargeable kind with a built in DC-DC converter.  That is the wrong choice for a DMM.  The EBL batteries that were linked are a 2S Li-ion package.  The voltage drops gradually and the low battery warning works.  The downside is that you need the special charger.
mikeselectricstuff:
If you're worried about leakage, wrap the battery in cling film
AVGresponding:

--- Quote from: edavid on October 21, 2023, 03:12:50 pm ---
--- Quote from: AVGresponding on October 19, 2023, 04:44:14 pm ---
--- Quote from: bdunham7 on October 19, 2023, 01:51:07 pm ---Just use an EBL 6F22 lithium battery, rechargeable or primary.  Coin cells don't sound very efficient, although it's true that type of meter doesn't exactly draw much current.

https://www.eblofficial.com/products/9v-batteries-with-battery-charger

--- End quote ---


EBL, Znter, am currently trying the brand "PUJIMAX" in one of my DMMs, seems fine. Only issue you get with these is they give a constant voltage until the internal cell is empty then just stop, so you don't get a low battery warning.

These are quite a bit less than a tenner these days, I see no good reason to use anything alse (in most use cases, YMMV).

--- End quote ---

It sounds like you are talking about the USB chargeable kind with a built in DC-DC converter.  That is the wrong choice for a DMM.  The EBL batteries that were linked are a 2S Li-ion package.  The voltage drops gradually and the low battery warning works.  The downside is that you need the special charger.

--- End quote ---

Wrong how?   :-//
wasedadoc:

--- Quote from: Kleinstein on October 20, 2023, 04:36:50 pm ---The 9 V Li blocks are some 1.2 mAh...

--- End quote ---
Nope.  Much more than that.  :)
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