Products > Test Equipment

using 3x CR2032 to power a fluke 77 series meter

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Kleinstein:
There are 9 V Li primary cells, often intended for smoke detectors (to get a 10 year lifespan) and similar.
Rechargeable only makes sense if empty every few weeks and not for a few years.

AVGresponding:
I get a few months out of the Znter in my 87V, my work meter, remains to be seen about the runtime of the PUJIMAX, it's in a TekDMM912, and is my current daily at home.

bastl_r:
Hello

I get a lot of 1/2AA Li batteries which have served as backup batteries for 3 years. These are regularly like new and have about 1000mAh. Three of these fit exactly into a Fluke 9V battery slot and last what feels like forever even with frequent use....
With button cells, I am concerned if they can supply the current for the resistance measurement and the continuity beeper.

robert.rozee:

--- Quote from: Kleinstein on October 19, 2023, 06:12:07 pm ---There are 9 V Li primary cells, often intended for smoke detectors (to get a 10 year lifespan) and similar.
Rechargeable only makes sense if empty every few weeks and not for a few years.
--- End quote ---

Li-Ion and similar make great sense if they are cheap enough and their self-discharge is so low they can hold up for several years. as an example, i've seen e-cigarettes containing a Li-Ion cell but with no means of accessing or recharging it. while rechargeable, it was cost-effective for the manufacturer use it in place of a primary cell.

also to take into account is the cumulative damage to the plastic screw bosses every time a fluke 70 series is opened up.

i still like the two stacks of 3x CR2032 idea, despite what others have said; the CR2032 has become so ubiquitous that the price of six has dropped below that of a single 9v lithium primary.


cheers,
rob   :-)

Kleinstein:
The 9 V Li blocks are some 1.2 mAh, while Cr2032 is around 200-260 mAh. So it takes 3 in series and some 5 or 6 in parallel to replace one of the 9 V ones.

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