a123 battery packs
10-28-2007, 09:14 AM
#31
Well, seems to have been done. Don't knowthat it is dangerous.
10-28-2007, 09:23 AM
#32
Cain, if 13.2 volts is close enough, I have seen folks charging 4S A123's directly off a car battery with no "charger". Have you seen that? They just use some power cord as a slight limiter and they watch the voltage for when it is ready to top off. The charging is so fast that unattended charging is not required.
I remember 1988 that was a fast charger for a 7.2 nicad, just 10 - 15mins and she was done,,,,,,the cable was just like pushbike brake cableoh the days,,,,if you couldnt touch the batt "DING" readymy dad would even start the car for a super charge.......
true..i want my hornet back....
10-29-2007, 01:59 AM
#33
WOW thats dangerous. i heard it works for Ni-cad, but then they're like that. lithium requires a special charge sequence, which for the first 90% of the charge its fixed current, and the last 10% fixed voltage. so theyre only charging to about 90% anyway, as well as having basically a bomb! the car battery will be chucking 700 amps into them! thats alot of current! (and the wires will melt if you leave it for longer than a few seconds)
and D4, uranium isn't very reactive. one of the most is something like ceasium i think.
and D4, uranium isn't very reactive. one of the most is something like ceasium i think.
aint uranium that reactive? i thought it was, oh well, you learn sumthin new everyday
10-29-2007, 04:36 AM
#36
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heh i self taught myself... i never learn anything in school now. maybe the odd little fact every lesson?
10-29-2007, 05:56 AM
#37
The directions said to never start the car That was my fisrt charger, two cables with aligater clamps on one end and tamaya plug on the other. I used my hand as the peak detector and the cut off.
I remember 1988 that was a fast charger for a 7.2 nicad, just 10 - 15mins and she was done,,,,,,the cable was just like pushbike brake cableoh the days,,,,if you couldnt touch the batt "DING" readymy dad would even start the car for a super charge....... true..i want my hornet back....
That was my fisrt charger, two cables with aligater clamps on one end and tamaya plug on the other. I used my hand as the peak detector and the cut off. I remember 1988 that was a fast charger for a 7.2 nicad, just 10 - 15mins and she was done,,,,,,the cable was just like pushbike brake cableoh the days,,,,if you couldnt touch the batt "DING" readymy dad would even start the car for a super charge....... true..i want my hornet back....
10-29-2007, 12:11 PM
#38
Does anyone know where I can see some pics of the A123's mounted in a 1/8 scale buggy?
I think the 13.2V setup would work fine, especially if I used a 2 or 1.5 Neu motor. I just want to see what it would look like mounted. to get an idea of what to try.
I think the 13.2V setup would work fine, especially if I used a 2 or 1.5 Neu motor. I just want to see what it would look like mounted. to get an idea of what to try.
10-29-2007, 12:41 PM
#39
I would build 4, 4cell side by side packs in series. Then stack two packs on top of each other and wire them all in series. Then you can go and zip tie two packs down on each side of the car. If you are worried about them getting wet then zip tie them in a bag and fill the end of the bag w/ epoxy.
10-29-2007, 07:27 PM
#40
So, are the a123 cells from the Dewalt batteries 2400mAh each? I know they are 3.3v per cell, but wasnt sure about the mAh.
10-29-2007, 09:02 PM
#41
2300mah. A 4p pack will make a 9200mah pack.
10-30-2007, 08:07 AM
#43
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If you guys are serious about A123 cells, start checking forums that they are used on a daily basis.
www.rcgroups.com and www.runryder.com.
I personally use a Mastech powersupply and charge an 8s pack at 10amps, strait from the power supply. Its a CC/CV lab grade power supply.
www.rcgroups.com and www.runryder.com.
I personally use a Mastech powersupply and charge an 8s pack at 10amps, strait from the power supply. Its a CC/CV lab grade power supply.
10-30-2007, 10:11 AM
#44
Guys, these packs aren't like mounting a fuel tank. Go and build two 4s2p packs, wire them up in parallel and mount them in a location that will leave your chasis balanced how you want it. The easiest way to do this is take a fully fueled rtr nitro buggy and put a scale under each wheel. Now, measure the weight on each wheel. Now go and balance the buggy w/ the same weight ratio from wheel to wheel. So if ur rtr nitro has 2lbs on the front wheels and 2.5lbs on the rear wheels then make sure that the weight ratio is the same on the electric when you mount your batteries. You also want to make sure that the parts are as close to the middle as possible.
10-31-2007, 07:13 AM
#45
Alright guys, I just set up a mini inferno-t w/ these cells. I am running an a123 cell on each side w/ a mamba system. It delivers plenty of power for racing this thing too. I get a lot more punch then I was getting and top out at around 25-30 m.p.h. which is more then enough for racing these things off road. The cells also fit perfectly into the little battery boxes too. If you want more speed for bashing around then pick up that voltage converter that a123 sales and you can run w/ 10.8volts.