RE: SV27 Battery Thread
 

what is your MV set to . some times you can have them set to low and you will not get them to peak , you have to have them abouve 5 to get them to top up . and a regualr 7.2 volt batterys will some times go more then the MAH and will end at about 8.5 or 9 volts , it is normal

RE: SV27 Battery Thread
 

Has anyone had any luck running the spetacularly cheap Tenergy batteries from all-battery.com? I have 4 packs of 3500mah on the way, they were only $50 for all 4! I've seen pretty good reviews of them from other people, but I wonder what they'll do in the SV27.

On the topic of IB batteries, here's a pic of the IB 3600 packs I ran the day my motor fried. They were brand new stick packs on their first charge. I knew the puny tabs connecting them might get a little warm, but this is ridiculous. Those packs had a hell of a punch, I'm sure the extra voltage they dumped out was part or the reason the motor got so hot. Imagine what 7 cell IB packs would have done!

I have since soldered them into side by side packs with deans bars, and heavier gauge wire.

RE: SV27 Battery Thread
 

That is probably the best justification for upgrading to Deans 12g wire and real connector bars on your packs.

RE: SV27 Battery Thread
 

Rooski[sm=thumbup.gif];) That is exactly why I don't like stick packs. I always run flat side by side packs with good battery bars and 12awg wires and deans connectors. Especially on high amp draw applications.
PS aren't those the intellect cells? I didn't know those were the IB cells

RE: SV27 Battery Thread
 

YEp, those are Intellect IB 4200 Cells

RE: SV27 Battery Thread
 

Wait a minute. I was under the impression that Intellect Battery cells were IB cells. I don't think they are. IB 4200's are made by Epic. They have a white label with IB in big black letters.

Either way, those Intellect 3600's had all the power I need...the boat just flew with them.

So the touchy IB 4200's you guys are talking about are not Intellect cells right? In other words, I don't have to tiptoe around while charging these.

RE: SV27 Battery Thread
 

I do stand corrected. Your are 3600's. The ones on Steven site how ever are IB 4200's I really don't hink it make a differance but they are really nice cells

RE: SV27 Battery Thread
 

Yeh, I charge them w/ peak cutoff set to 50mv. All three packs do it. And actually I have one set of DTX3800s that will only charge to 8.92v max, while the others slowly went up to 9.17v (all 3 sets are the same age as far as use). Last night, one pack (a 8.92v max charge) fried on me after 2 minutes of run time (the other pack that was 8.92 finally hit 9.05v after topping them off before hitting the lake). The cell fried. I think that's where the prob was; that cell was giving me the lower v. Anywho, I order 2 4500s and another DTX3800 to replace the bad pack. I'll keep the other cells from that pack, provided VIR checks out.

Thanks.

RE: SV27 Battery Thread
 

Sounds like cheap battery problems. I don't think its your charger. But then again, that charger is kind of new on the market and it could have its own issues.

RE: SV27 Battery Thread
 

I don't think it's the charger either....it's just real sensitive. I checked what was left of the cells and one other one that hadn't fried was way off on v/I. The first cell just had enough. What are the odds of 2 bad cells in an unmatched pack from DTX? Again, new to niMh packs, have you heard any bad about DTX?

I ordered the 6 cell 4500s this morning. Don't want to go to 14s, stay with 12s, since I have my numbers and cg figured.

RE: SV27 Battery Thread
 

Where are you guys getting your 4500's form.
Dan

RE: SV27 Battery Thread
 

Dan,
Try cheapbatterypacks.com.

RE: SV27 Battery Thread
 

kk
i posted that eariler i was just wondering if u got em from somwhere else?
Dan

RE: SV27 Battery Thread
 

I also bought 14cells of these new 4500's. They should arrive Sat or Monday.

I will be building them side/side with bars and 12ga leads.

I use Astroflite 112D chargers $130. I charge my 4x 6c-GP3300's at the same time @50min at 4.5A.

Breaking them in:
1- Slow charge @2A until peaked, wait 2 hrs then discharged @1.5A down to 0.90v/cell. Then wait 60 minutes.
2- Slow charge @2A until peaked, wait 2 hrs then discharged @1.5A down to 0.90v/cell. Then wait 60 minutes.
3- Slow charge @3.5 A until peaked, wait 2 hrs then discharged @1.5A down to 0.90v/cell. Then wait 60 minutes.
4- Slow charge @4.5 A until peaked, wait 2 hrs then discharged @1.5A down to 0.90v/cell.

I will post the numbers after the initial 4 break-in cycles.

Then posting 10 "Real world numbers" gained in my SV27 with cooling mods and worked Prather Bronze 220 2-bladed prop.. Charge at 4.5A and run them twice a day, at least 2hrs between charging from 1st run.

-WL

RE: SV27 Battery Thread
 

They read as 3A slow/6A fast WOOT!!!!! Means low internal resistance= lots of power R-R-R [8D]

Making the packs after dinner......... and start the break-in process.


-WL


Enter Time warp [sm=spinnyeyes.gif]

The break-in has started. This is 1st charge at 2A.

RE: SV27 Battery Thread
 

Nice packs. I'm bet they'll be awsome. tell us how they are.
Dan

RE: SV27 Battery Thread
 

1) 1st Charge at 2A
2) 1st Discharge 1A
3) 2nd Charge at 4A
4) 2nd Discharge 1A
5) 3rd Charge at 5A

-Charging 3rd cycle @5A now.....

-WL

RE: SV27 Battery Thread
 

it took 4 hours to discharge !!

RE: SV27 Battery Thread
 

What about LiPo? Will 11.1V or two 7.4V work?

RE: SV27 Battery Thread
 

Oops...sorry. I should have done a search. Thanks people. Great info here.

RE: SV27 Battery Thread
 

2, 7.4's will

RE: SV27 Battery Thread
 

That is a NICE charger. I was looking for a better than average charger after being gone for a few years, and that one looks awesome! Forty cells off of 12v? Wow. Can you get it to cycle packs automatically?

RE: SV27 Battery Thread
 

Nope, buy a Trition2, or 2 would be great ... once they are in stock at TowerHobbies, I'll order 1 myself.

But I had the 112D from my airplane days, it's still a good buy at $130 and goes up to 8A&40cells:D
-WL

RE: SV27 Battery Thread
 

After 3 cycles it shows @4250mah average down to 0.90v/cell usable capacity. Will see if they wake up a little once they see 40-50A and 6A charges.

Once my Watt's Up meter arrives, I'll make an adjustable discharge system to do from 5A-50A.

-WL

RE: SV27 Battery Thread
 

Nice pic, Waterlogged. And yes that is a nice charger. I want t Triton2 but that is nice. and again I like the way you did the pic. :)