Path: ...!weretis.net!feeder8.news.weretis.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: "Jim Wilkins" 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 Organization: A noiseless patient Spider Lines: 23 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit Injection-Date: Fri, 17 May 2024 14:30:57 +0200 (CEST) Injection-Info: dont-email.me; posting-host="8bf716e0cce0035594b5d850c842253b"; logging-data="2312384"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/NEqPb2Ti4ThJDgLx16cR9kdRPtH9uCbE=" Cancel-Lock: sha1:fug7H7Ek2BGYmlYX8zBIjCvHM0U= X-MSMail-Priority: Normal X-Newsreader: Microsoft Windows Live Mail 16.4.3505.912 In-Reply-To: X-Antivirus-Status: Clean X-Priority: 3 Importance: Normal X-Antivirus: AVG (VPS 240514-8, 5/14/2024), Outbound message X-MimeOLE: Produced By Microsoft MimeOLE V16.4.3505.912 Bytes: 2700 X-Original-Lines: 2 "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.