Devon Posted December 5, 2010 Report Share Posted December 5, 2010 A Dewalt DC9280 has 8 A123 LiFePO4 cells in it. They're 3.3v, 2300maH. These batteries lose 1% of their charge a year, if unused. Voltage stays near perfect until it's just about dead. 4 cell is 300 grams. Get your DC9280, and crack it open. Note that the 8 cells are wired in series. Chop it where the first 4 meets the second 4 (The connections between the batteries are a sheet metal stip, you can even use a beasty pair of scissors to cut it, but be careful not to short the cells out as the entire outer skin of the cell is the negative terminal). Once you've done that, get a 100W or greater soldering iron, solder on some cable, and you're done. One piece of superlight battery. Do the same with the other 4 cells, and you've got two batteries. Link to comment Share on other sites More sharing options...
kaighn80 Posted December 6, 2010 Report Share Posted December 6, 2010 just to add you could run the 2 sets of 4 cells in parallel and double the capacity, im thinking of doing this for my vfr, what sort of cca do they put out and how long is it sustainable for? Link to comment Share on other sites More sharing options...
kaighn80 Posted December 7, 2010 Report Share Posted December 7, 2010 been looking at just buying cells to do this instead of a battery that seems bloody expensive, but they say they can only be charged up to 1000 times and that to get the best out of them they should be ballenced, which basically means charging each cell individually, can anyone shed some more light on this as it don't seem as cheap as buying a light weight battery anymore. Link to comment Share on other sites More sharing options...
Timbo S2 Posted December 7, 2010 Report Share Posted December 7, 2010 So I buy the dewalt battery, split it and end up with two. Can I use any other battery (Dewal are expensive)... Link to comment Share on other sites More sharing options...
kaighn80 Posted December 7, 2010 Report Share Posted December 7, 2010 like most web advice it depends on who you ask, on another site i found a thread that was using cr123a cells four in a row and 2 or 3 rows that was starting a sp1, so it invariably has enough cca's but im worried about the life expectancy of the battery pack and the charging circuit, its something i would love to do on the viffer so she could loose a bit more weight but untill i have more details its an idea that might not make it to the bike. what i want to know is what sort of life expectancy it will have and am i looking at replacing the rest of my charging system to cope, if so then its more work than i'd like to do with sparky bits. Link to comment Share on other sites More sharing options...
Devon Posted December 8, 2010 Author Report Share Posted December 8, 2010 i think you can get them for about £40 on ebay. but i cant really see why you cant use a cheaper batteryif they have the same or similar innards Link to comment Share on other sites More sharing options...
kaighn80 Posted December 8, 2010 Report Share Posted December 8, 2010 just pulled a woolworths 24v hammer drill apart and found 20 1.2v 1300mah cells! might try this as it cost me nowt! Link to comment Share on other sites More sharing options...
2moto Posted December 8, 2010 Report Share Posted December 8, 2010 Not worth the effort, I am afraid. At 1.2 volts per cell, they'll be either NiCd or NiMH, neither of which are suitable for bike charging systems. Plus you'd need 22 of them to get 13.2V and 2600 mAh, which is the absolute minimum to make a barely useful bike battery. Link to comment Share on other sites More sharing options...
addiction269 Posted December 12, 2010 Report Share Posted December 12, 2010 check these out - gonna have a go when i get bored - seems pretty simple and plenty of details http://www.customfighters.com/forums/showthread.php?t=32323 http://www.r1-forum.com/forums/showthread.php?t=268406 just make sure you use LiFePo4 batteries if using Li, as these are the only safe ones, the rest explode lol Link to comment Share on other sites More sharing options...
kaighn80 Posted December 12, 2010 Report Share Posted December 12, 2010 if anyone is interested i have plans for a spot welder (the type used to weld batterys together). Link to comment Share on other sites More sharing options...
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