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Old 07-09-2007, 01:59 PM   #1
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Default Stick packs in Ofna Chrome Top Box?

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What "custom modifications" are needed to use stick packs in the chrome top starter box? I can't think of anything to radical that would be needed. But I am still pretty much a newbie. Thanx for any info.
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Old 07-09-2007, 04:48 PM   #2
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IMO that's a seriously bad idea unless you are talking about 4200 mah packs. And even those are far inferior to a much cheaper 7000 mah sealed lead acid cell or, preferably, a 13,000 mah HT Batteries Li-po pack. Li-po is light and strong.
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Old 07-09-2007, 04:53 PM   #3
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13,000 DAMN. that's big. Would that be a 14.1v battery?

Is this the battery you are referring to?
http://www.htbatteries.com/Public_ht...ox%20Packs.htm
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Old 07-09-2007, 06:35 PM   #4
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Yep, that's it. If you have a Power Panel on your box you can also use your starter box to power your RX charger. I did this at my last race. It worked great and I didn't need to bring a long AC extention cord. Of course I was pitted right next to the drivers stand...
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Old 07-09-2007, 06:42 PM   #5
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So do I need to make a battery hold down to use in the chrome top? Or will it work with the items that come with the box? What are the dimensions of this bad boy? I can't really tell from the pics.

Oh, and does the instructions let you know what the C rating is? I need to find out if my charger can handle it.
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Old 07-10-2007, 11:03 PM   #6
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Quote:
Originally Posted by satoch View Post
....a 13,000 mah HT Batteries Li-po pack. Li-po is light and strong....
Are you sure it's rated that high? The reason I ask is because of the charge amp ratings on the HT multi charger. It would take 13 amps to charge a 13,000 mah pack at 1C and the HT charger can only push 2 (or maybe it's 2.5) amps, which at 1C is only going to fast charge up to around 2,000 mah unless you have a couple of days to kill while your battery charges.

I seem to recall from a converstaion with an HTBatteries rep last year that the starter pack is only rated at 1800 mah, and the charge times I've seen on a couple of HT rigs are about right for a full fast charge at 1C. That would mean the pack would have to be real close to the max amperage output of the charger.
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Old 07-11-2007, 01:36 AM   #7
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I'm gonna ask HT what size it is. 13,000 seems pretty high. 1800 sounds more reasonable, but I'm still new to the battery tech. I thank you guys for the info.
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Old 07-11-2007, 09:31 AM   #8
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I have the HT lipo pack in my chrome top and it works great, however it's only 2200mah. So I need to charge it about every race day or so. BUT it's SUPER LIGHT!
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Old 07-11-2007, 11:20 AM   #9
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Quote:
Originally Posted by magbarn View Post
I have the HT lipo pack in my chrome top and it works great, however it's only 2200mah. So I need to charge it about every race day or so. BUT it's SUPER LIGHT!
You're saying you use the battery posted a few posts back? charging before every race would be no deal to me. I just want it to work right.
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Old 07-11-2007, 09:30 PM   #10
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bah thats rubbish.

i run 2 3300 stick packs in ofna chrome top. i can easily get two days of racing without a charge. they will work perfect and make your box A LOT lighter. you need to wire up your battery to where the gel cell used to plug into to. you run the negative wire to one of the stick packs. then run the positive wire to the + on the other stick pack. (thats one wire per stick pack.) then run another wire from the open - and open + on each pack and connect them together. that will run 14.4 volts.

your box will have a ton more starting power. plenty to turn over any engine on the market.

and i secured my two stick packs with double sided tape in the rear of my box.

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Old 07-11-2007, 09:51 PM   #11
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Originally Posted by KForce View Post
bah thats rubbish.

i run 2 3300 stick packs in ofna chrome top. i can easily get two days of racing without a charge. they will work perfect and make your box A LOT lighter. you need to wire up your battery to where the gel cell used to plug into to. you run the negative wire to one of the stick packs. then run the positive wire to the + on the other stick pack. (thats one wire per stick pack.) then run another wire from the open - and open + on each pack and connect them together. that will run 14.4 volts.

your box will have a ton more starting power. plenty to turn over any engine on the market.

and i secured my two stick packs with double sided tape in the rear of my box.

kyle

All right that's cool. I just thought there was something a little more than that. That is the way most boxes are wired up for the two stick packs isn't it? But sounds like you can use all the types of power for this box. And that is good to know. I guess if one way doesn't work I will try the next. So I thank you guys for all the info.
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Old 07-11-2007, 10:06 PM   #12
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I want to convert my Mugen box to lipo but unsure which would be better one 14.8V at 2200mAh http://www.rcmart.com/catalog/produc...ducts_id=19561

or two 7.4 at 2200mAh each
http://www.rcmart.com/catalog/produc...ducts_id=19531
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Old 07-12-2007, 07:59 AM   #13
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I use a gel cell in one box and either 2 x 3s1p Li-ion packs or 2 x 3800 nimh packs. The li-ion packs are light and at 19.8v have plenty of juice for tight engines.
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Old 07-12-2007, 09:24 AM   #14
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You'll never run out of power with this li-po pack:http://www.all-battery.com/index.asp...OD&ProdID=1687
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Old 07-12-2007, 09:48 AM   #15
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Quote:
Originally Posted by satoch View Post
You'll never run out of power with this li-po pack:http://www.all-battery.com/index.asp...OD&ProdID=1687
WOW! A $350 starter box?

As for stick packs, I've run an old duratrx box with a single 12V motor just like the ofna chrome top and it did fine with 2 1800 nicd sticks. It would make a day or two of racing just fine. Back then it was somewhat of a pita as I didn't have a charger which would charge them without having to unplug and do them individually. Before the stick packs I carried a 30A rivergate ps and used it to run 2 8th buggy bump boxes, 3 chargers, and several glo stick quick chargers.
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