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

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coromonadalix:
for the 187 189 series, you can still find the bp-189 battery pack at a good price  loll


For my "ol" Gossens,  i found out the external x-formers to supply them ... hefty prices ...



 

Everlanders:
I've been wondering for ages if this could be done to an old 187.

The battery connectors are shot, and it's on old beater that I've been soldering AA alkaline battery packs into every year.

Ideally I'd use 2x 18650's, But I'm worried that the voltage may be too high for a meter designed for 4x AA, Do you think it would take it?

Ingineer:
You could use 2 LFP cells, or use Ternary, but add a few diodes to drop the voltage, each diode added is about 0.7v, so if you add 3 diodes you'll be safe.

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