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-   -   Dark Impact is in, now i need batt packs (http://www.rcuniverse.com/forum/rc-electric-off-road-trucks-buggies-truggies-more-147/9826432-dark-impact-now-i-need-batt-packs.html)

saleens7 06-25-2010 12:54 PM

Dark Impact is in, now i need batt packs
Well the Tamiya Dark Impact I got on ebay just got in today. Everything looks good so far, but I still have 2 problems. I need to buy a batt cover (the seller had lost his) and I need to get a batt pack for it. I was considering modifying it a bit to fix two of my little 2S packs in parallel in it, but with the amount of money I saved buying this thing used over paying an extra 50$ for it new, I figured I could buy the right lipo for it as well. I'm sure this question is asked many times over in this forum, but I seem to be having bad luck finding info about batt packs to use, and the DI thread has over 100 pages to sort through looking for such info...something I'm not about to do.

I'm looking for a 2s2p lipo that will fit in the space meant for a 6 cell nimh pack. I've been out of RC for a while now and am not too sure which brands are the best to look at. What would be some good reccomendations for a 2S2P lipo for around 40-60$? I would be running a Feigao 8S (4436kv) through a supersimple 100amp esc.

As an incentive, I promice to post pics and hopefully some video of it running if I can get some help with this :D

Slo-V Flyer 06-25-2010 01:10 PM

RE: Dark Impact is in, now i need batt packs
You don't need 2s2p lipos. You can do fine with a simple 2s1p or 3s or 4s or whatever you need, in the 4000-5000+ mah range. ;) the only reason you need parallel packs used to be to get more amps/capacity in the old days with 2000-3000 mah lipos. I think. Most lipos today are good for 15-30C and 4-5000 mah.

The cheap good stuff as far as lipos can be found at hobbyking.com. Look for Turnigy, Zippy, or Rhino (though Rhino's tend to be longer, like a 7-cell nimh). They usually have the popular lipos in stock if you know which ones to look for. I just saw several hardcase packs in the 4-5000 mah 2s range raged for 20C for $20 on there, in stock.

Here's a few links:

[link=http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8357]Zippy Flightmax 2s hardcase 4000 mah 25c[/link]
[link=http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10098]Turnigy 2s 5000 mah 20C hard case[/link]

Or try searching for "hardcase" and that'll bring up a bunch. You DONT need hardcase, but those happen to be in stock, and are the exact size of a 6-cell as I understand. Other in plane shrink wrap can be a little thicker or a bit longer and may not fit certain cars with only 6-cell Nimh space.

FieroMan121 06-25-2010 02:00 PM

RE: Dark Impact is in, now i need batt packs
yeah and a number of brands make shotgun pack shaped packs now

saleens7 06-25-2010 10:38 PM

RE: Dark Impact is in, now i need batt packs
Well, here another thing....Im not entirely sure if i should go 2S or 3S....i have a 4436kv motor, i know the gearing between the pinion and spur gears is about 3 to 1, but I'm not too sure about the diffs, and if they're geared or not. I guess I can go 2S for now, but what speed should I be looking at?

positron 06-26-2010 02:39 AM

RE: Dark Impact is in, now i need batt packs
i have a yeah racing lipo hardcase stick pack that doesnt fit in my DI, so I'm still using a little turnigy wrapped in bubblewrap, I think to be safe you will need a rectangular hard case with banana plugs.

saleens7 06-26-2010 09:21 AM

RE: Dark Impact is in, now i need batt packs
So hmmmm....my ESC doesn't have a BEC.....this is a bit of a problem....would this be the right thing to use?


Will this drain any more power from my battery than would an ESC with built in BEC?

I could also save up a bit and buy this ESC, The Feigao motor chart says the 8S will pull about a max of 81amp, but would i be ok with a 60amp ESC?

http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=7188&Product_Name=Turnig y__Brushless_ESC_60A_w/_Reverse_prog._(v2.2)

saleens7 06-26-2010 01:38 PM

RE: Dark Impact is in, now i need batt packs
I ended up buying the 4000mah 30C 2s1p hardcase flightmax pack and that little hextronic UBEC. The ESC from my boat is pretty big, but i have just enough room to mount everything in there. Getting the wiring under control is going to be a b!tch though. Origionally the ESC and Rx were on one side, with the servo on the other. With my ESC, it takes up so much space, I can just barely get the body on with it in there. The Rx will be mounted over by the servo (on its side, as it wont fit inside the tub when mounted flat), and the UBEC will have to squeeze in next to the esc. It's going to be a bit of a complicated setup, but until i can buy a nice little car ESC, this will have to do. Luckily, no modification will have to be done, except for cutting a small bit off of the back of the body, so the wires from the motor can fit through.

Oh, and here's the pics i promised. (I took the spur gear cover off to remove the pinion gear, and to see if it had a slipper clutch or not)




Slo-V Flyer 06-26-2010 01:45 PM

RE: Dark Impact is in, now i need batt packs
Look for an EZ-run 60 or 80 amps ESC and you'll be covered as far as your proper car ESC needs. I'm already running a "ZTW" 60A esc in my trucks, on 3s with bigger 60mm length motors and have so far good luck with the setup.

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