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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Sub-C NiCad vs AA NiMH in a cordless drill pack
Zaf wrote:
I have a very nice cordless drill with a dead NiCAD Pack. The mfg wants $50 for the 10 cell pack. Sub-Cs delivered mail order to replace these would probaly run ~$30+. Based on what I see on the capacity of the NiCad Sub Cs, the AA NiMH have surpassed them and are about a buck a piece ). The only question is how much will the (higher) battery ESR of the AAs work in a cordless drill. Any thoughts on this? Post the drill came with a 1 hour charger, How would a NiMH fare with this? The answer to your question is critically dependent on the EXACT specifications of both battery types and the charger design. Ohms law will tell you the effects of the higher resistance. Remember that capacity specifications are often specified at a 20 hour discharge rate. YMMV a LOT at 5 amps. Bottom line is that you have little chance of finding all the info you need to make an informed decision. If you want to drill holes, go buy the $50 pack. If your objective is to mess around with batteries, get some other type. mike -- Return address is VALID. Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121 Bunch of stuff For Sale and Wanted at the link below. HP200LX 10MB + MODEM + LEATHER CASE Sony Digital Camera Compaq Aero floppy,ram,battery. FT-212RH 2-meter 45W transceiver. Toshiba & Compaq LiIon Batteries, Test Equipment 30pS pulser, Tektronix Concept Books, spot welding head... http://www.geocities.com/SiliconValley/Monitor/4710/ |
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Sub-C NiCad vs AA NiMH in a cordless drill pack
On Thu, 29 Jul 2004 03:57:39 GMT, Isaac Wingfield
wrote: In article , (Zaf) wrote: I have a very nice cordless drill with a dead NiCAD Pack. The mfg wants $50 for the 10 cell pack. Sub-Cs delivered mail order to replace these would probaly run ~$30+. Based on what I see on the capacity of the NiCad Sub Cs, the AA NiMH have surpassed them and are about a buck a piece ). The only question is how much will the (higher) battery ESR of the AAs work in a cordless drill. Any thoughts on this? You can find decent "new old stock" sub-C NiCds from time to time he http://www.sciplus.com/. Good price, too. Isaac You can get sub-c nicads brand new at Harbor freight Tools, Here's how: Harbor Freight sell Chicago Electric brand cordless drills, from 9.6 volt up to 12 volt. The battery packs for the 9.6 volt drills sell for 3.99. They contain sub-c batteries. The pack is held together with 5 screws. Take the pack apart and desolder the battery cluster and you'll have your sub-c's at a bargain price. I buy these all the time and use the sib-c's for all sorts of portable power solutions from flashlights to dv camcorders. Each 9.6 volt pack contains 8 sub-c's which brings the price per battery to just under 50 cents. A bargain that's nearly impossible to beat. |
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Sub-C NiCad vs AA NiMH in a cordless drill pack
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