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Old 10-31-2007, 10:04 AM   #46
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Just bought a 36V Dewalt battery off of ebay. Gonna try 2 cells in series for my 1/10 4wd and evenually 4S2P in my next elec. 1/8th. Read through some of the info rpnick linked to and found this: How to build a123 packs from Dewalt batteries: http://www.rcgroups.com/forums/showthread.php?t=599316

Going to try using my ICE charger, set on Li-ion. Voltage cutoff is a bit high, and I'll have to fiddle with the capacity to be able to charge at higher rates. Dunno if I'll try charging at 10 amps, maybe 5-6 amps to start with and see how it goes.
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Old 10-31-2007, 11:50 AM   #47
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I'd be willing to bet that duratrax has an update that will allow the charge to charge a123 cells. I bet if you gave them a call they could tell you exactly what you needed to do.
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Old 11-02-2007, 07:23 PM   #48
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Here's pics of my a123 cells installed in my Academy SBV2 4WD. Running 2S2P for ~6.6V @ 4600mAh. Currently have a 7.5 BL motor, but if it's not fast enough due to voltage, I'll drop in the 5.5. Since I don't plan of having to take the batteries out, they are servo taped to the chassis with a double wrap of strapping tape around the batteries/chassis.
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a123 battery packs-imag0028.jpg   a123 battery packs-imag0029.jpg  
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Old 11-02-2007, 07:25 PM   #49
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How has the chassis balance been? is the pack significantly heavier than comparable 4200 NIMH packs?
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Old 11-02-2007, 07:32 PM   #50
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Quote:
Originally Posted by Stealth_RT View Post
Just bought a 36V Dewalt battery off of ebay. Gonna try 2 cells in series for my 1/10 4wd and evenually 4S2P in my next elec. 1/8th. Read through some of the info rpnick linked to and found this: How to build a123 packs from Dewalt batteries: http://www.rcgroups.com/forums/showthread.php?t=599316

Going to try using my ICE charger, set on Li-ion. Voltage cutoff is a bit high, and I'll have to fiddle with the capacity to be able to charge at higher rates. Dunno if I'll try charging at 10 amps, maybe 5-6 amps to start with and see how it goes.
ICE only charges to 8 amps dont it? mine only had 8A max
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Old 11-02-2007, 07:46 PM   #51
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Balance seems to be good. I was using an Orion 3200mAh Carbon pack, and had to add a lot of lead to that side of the car to even come close to balancing. These cells by themselves seem to balace the car well.
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Old 11-02-2007, 07:47 PM   #52
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good stuff. Too bad no where to race a 4wd e buggy out here. Tracks outdoors are pretty much 1/8 scale oriented.
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Old 11-04-2007, 09:22 AM   #53
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Ran the car last night with the a123 cells. Started in practice with the same 7.5 motor I've always run. Even geared up 2 teeth, it still felt slow and lacking oomph. Put in the 5.5 motor, geared up 3 teeth and it felt great. Plenty of rip, without overpowering the level of traction on the track. TQ'd and won the A, but that was more due to the Academy handling the blown out sections of the tracks better than the Losi's.
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Old 11-04-2007, 10:33 AM   #54
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how much run time were you getting with the 2p config and the 5.5 motor?
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Old 11-04-2007, 11:39 AM   #55
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Dunno total run time, but ran my 5 min main, then jumped in and ran a 2nd 5 min race on the oval (we moved 2 pipes and ran the outside of the track), and still had runtime to spare. Guess I'd get 12-15 of runtime.
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Old 11-04-2007, 11:16 PM   #56
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Hello Guys! Im planning to buy a New E Maxx and Im pretty curious about this A123 cells. Can you guys suggest what configuration and number of cells I need to power an E MAXX? It must be close to 16.8 Volts. TIA!
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Old 11-05-2007, 07:32 AM   #57
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5 cells in series will deliver 16.5 volts. Now, the issue is I am not familiar with the battery holder on the new trucks so I can't recomend a config. I will say though you can choose to run a 4600,6600, or a 9200 mah pack depending on how much room there is to mount the cells up.
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Old 11-05-2007, 08:00 AM   #58
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Here is a pretty good read on breaking down dewalt 36volt packs.

http://www.slkelectronics.com/DeWalt/packs.htm

You can find these packs on ebay for around $100 shipped.
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Old 11-08-2007, 11:42 AM   #59
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party_wagon: I am assuming these are the dewalt packs:

http://cgi.ebay.com/DeWalt-Li-Ion-DC...QQcmdZViewItem

For those who have the 4600mah 4S2P configuration, what are your pack dimensions? Seriously considering a 9200mah pack for my 1/8 scale buggy, would easily make 30 minute main then.
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Old 11-08-2007, 01:38 PM   #60
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how many cells in those packs? 10?
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