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Fluke 287/289 Lithium Mod - No More Batteries in the Trash!

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Ingineer:
For your Fluke 287 or 289, This is a super simple mod, the hardest part is removing all the plastic from back of the battery cover.  (It's also fully reversible, just order a new battery cover.)  It's also almost 150% better battery life than even AA (primary) Lithiums!

I used this 12mm x 60mm x 95mm (126095) protected 5Ah 2-cell LiPo (Lithium Polymer) battery from Aliexpress, it fits perfectly:
https://www.aliexpress.us/item/3256803542999333.html

I used some dikes and a vibrating multitool with a straight saw blade to remove most of the plastic on the back of the battery door.  The only mods to the meter itself was soldering on the battery connector, but that's super easy to remove in the future if desired.   I used a JST PH 2.0 two-pin connector for the connection to the meter so the battery is removable for charging.

Because I didn't want to compromise the Cat ratings or safety, I didn't add an external charge jack.  It's also not like you'll need to charge this often because of the long run time.  There is a is a hollow area near the top on the battery door that easily accommodates the battery connector as you can see in the 3rd pic.  I have an external charger setup, and when the pack needs charging, I just remove the battery from the meter.   The Fluke's battery gauge works fine with this 2-cell chemistry, and even though the meter works down to almost 5 volts, the internal protection circuit in the LiPo will probably cut out first.





 

coromonadalix:
the cell pack was made to go there   :-+

coppercone2:
I use a zero work mod called nimh batteries

Black Phoenix:
Yes I saw that mod being sold on tmall.com.

But the one I saw doesn't need any cuts and uses the original battery contacts, so no change on the battery cover:

BeBuLamar:
I wouldn't do that to my 289 and 287.

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