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5th May 2005, 05:44 AM #1
member
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Lithium-ion battery for power tool
The battery on my 18V cordless drill doesn’t seem to supply the power required from it. Normally I would have the battery repacked or buy a new drill, but I have got some new laptop batteries for a bargain and am think of utilizing them instant of disking out for a repack.
I am after the opinion of attaching 2 Toshiba 10.8V 3600MAH Lithium-ion batteries to the cordless drill.
My strategy is to attach the batteries to a tool-belt around the waist and have a wire connecting it to the drill, this way I don’t have to tamper with internals of the battery pack, and also reduce the weight of the drill. The wire will be in two parts one half permanently attached to drill and the other to the battery. Plugs will be on the loose ends of the wire for a quick-connect system.
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5th May 2005, 09:16 AM #2
Drop Bear Master
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Read an article recently on the merits/downfalls of different battery types, Li Io apparantly need to be charged correctly or can explode, from what I understood you need a dedicated Li charger, not the normal NiCad or Ni mH charger.
I haven't gone into the tech specs but check it out before you go although reading between the lines you will be using the laptop charger?Stupidity kills. Absolute stupidity kills absolutely.
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30th May 2005, 10:43 PM #3
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It looks like it’s not feasible to use the laptop batteries because the drill requires a large amount of peak current and cells in the laptop battery may not deliver sufficient current without sustaining damage to the cells, or posing a safety risk to the user, according to one article on the internet.
Another factor that will limited the use laptop battery in high current applications like power tools is the safety circuit. The laptop battery pack contains over-voltage and under-voltage monitoring circuits which control solid-state switches in series with the battery terminals. I have no intention to play around the safety circuit so the idea of using laptop batteries will be put on freeze. I will save up and buy another drill, this time a quality one not the $ 99 dollar ones.
On another note Milwaukee has released cordless tools using lithium-ion batteries. The cells are cylindrical and have different chemistry to the laptop batteries. They call it V28 lithium-ion.
They promotional internet site is worth checking out. They compare there V28 series power tools to the top of the range 18V Nicd tools via a multi-media presentation. The only think missing in the comparison is the GMC
http://www.v28power.info/flash.htm
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