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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: Got 4Ah, not 5Ah, battery 18V (20V) - done right thing?
Date: Fri, 17 May 2024 08:30:20 -0400
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"Richard Smith"  wrote in message news:m11q60aggz.fsf@void.com...

Hi Clare, Jim, everyone.
These are DeWalt powertool batteries - 18V (20V?).
This characteristic you identify "1C" etc. becomes knowable?
Rich S
--------------------------------

The problem with measuring C for battery tools is breaking the circuit to 
measure the current. Voltage is accessible by hacking the charger but there 
isn't room in the tool or battery for a shunt or Hall Effect sensor to 
measure current, and the battery connectors are very difficult to copy for a 
latching extension cord. I've had some luck reforming hobby store brass 
tubing into rectangular sockets and AC line cord plugs into solid brass male 
pins. I didn't try to fake the plastic housings, just made the electrical 
connections tight enough for non-mobile testing. Fine stranded silicone 
insulated wire is flexible enough to not dislodge the connectors.

Forming DIY electrical contacts is much easier with a lathe and milling 
machine. Collets are preferable on the lathe, to avoid squishing tubing and 
keep fingers away from chuck jaws. A small 6-jaw chuck is useful though not 
essential. Mine is on a 5C mount and last served in an indexer to mill a 
wrench hex on threaded rod, which a collet didn't grip securely enough.