My e-revo brushless edition build

[revo guy]

mistercrash I too got my turnagy packs today.
2 5000mah 3s 25c packs
one was perfect but in the other pack one of the cells is reversed. The cell voltages are
Total 3.65
C1 3.64
C2 -3.66
C3 3.65

and hobbycity requires that i ship back the defective battery for replacement. AT MY EXPENSE

[mistercrash]

That is not cool. I checked my 4 packs and they are ok. I'm trying to figure out how the cells and connectors of this pack of yours are configured.

[BL_RV0]

Originally Posted by revo guy

mistercrash I too got my turnagy packs today.
2 5000mah 3s 25c packs
one was perfect but in the other pack one of the cells is reversed. The cell voltages are
Total 3.65
C1 3.64
C2 -3.66
C3 3.65

and hobbycity requires that i ship back the defective battery for replacement. AT MY EXPENSE

That really blows. Maybe you could do the repair yourself or have james do it for ya. Probably cheaper than 2-way shipping to china.

[Snipin_Willy]

Wow, talk about an easy way to blow something up if you didn't catch it before using it.
Edit: wait wait....What does the total voltage of the pack read? Is it only the balance node that is in the wrong order?

[revo guy]

nope the total voltage is 3.65

[rawfuls]

Probably mis-soldered.

[mistercrash]

Today I found some time to put some Deans connectors on the 4 Turnigy packs. I charged them using my CellPro 10S and took one pair of them for a spin in the ERBE. The performance is very good, I don't detect any difference between those Turnigys and my 2S1P Neu 5500 mah 30C/50C packs. I did not have time to find out how long they ran before hitting the LVC which is set at 3.2 V. Maybe tomorrow. The fit in the ERBE's battery compartments is tight to say the least because of the 10 AWG wires coming out of the side corner. If you don't have those little spacers installed on the battery doors (check earlier in this thread) you will have some difficulties closing them.

Here's some numbers on the internal resistance of each cell that came from my charger after the packs were charged to 100% capacity.

Pack 1:
cell 1 = 1.6 milliohms, cell 2 = 1.8 milliohms

Pack 2:
cell 1 = 1.6 milliohms, cell 2 = 1.8 milliohms

Pack 3:
cell 1 = 1.6 milliohms, cell 2 = 1.8 milliohms

Pack 4:
cell 1 = 1.8 milliohms, cell 2 = 1.7 milliohms

Am I correct in saying that these low internal resistance numbers are a good sign that these packs are truly 20C/30C? And not 15C/20C. I read somewhere that higher C rate cells have lower internal resistance.

[mistercrash]

If anyone is interested in this, I finished running the first set of Turnigys I charged up yesterday. Sorry but no total runtime for now. My LVC is set to 3.2 V and I ran the packs until it kicked in. I let the packs cool down for an hour and hooked them up to the charger to recharge them. This is what the numbers were after the charge. Next time I should hook up the CellPro to the laptop so that I don't have to type this again

Pack 1:
Cell resistance - cell1 = 1.5 cell2 = 1.7
mah back in 4952
Volts just after charging 8.408

Pack 4:
Cell resistance - cell1 = 1.7 cell2 = 1.6
mah back in 5048
Volts just after charging 8.410

What did u make those blocks out of.

[mistercrash]

Originally Posted by erevodude

What did u make those blocks out of.

If you're talking about the servo blocks, they are made out of 3 mm thick twill weaved carbon fiber.

[mistercrash]

I am trying to stop smoking. I needed to do something to keep me busy so I made this carbon fiber MMM holder. Not really necessary but it looks cool. Problem is... I'm done and I want a frikkin' smoke

[brushlessboy16]

[mistercrash]

Whatever you say kid.

I ran the second pair of Turnigys 2S1P 5000 mah tonight and got 15 full minutes of hard running. More like a race simulation than bashing. Not bad and the power was very very good. I'll let them cool down and recharge them later tonight. Right now, I'm very happy with these batteries that I bought for $19.99 each.

That CF holder I made for the MMM did very well. The MMM didn't move. And by the way, that MMM I accidently ran on 10S a couple weeks back is still running like a champ. Go figure.

Originally Posted by mistercrash

If you're talking about the servo blocks, they are made out of 3 mm thick twill weaved carbon fiber.

no i mean the diff blocks

[mistercrash]

ok, sorry about that. The diff blocks were made out of a piece of cutting board bought at the dollar store.