Sony US26650VT Li-ion Cells - Need More info

Very cool and interesting thread. Im always looking for something to replace my old beat up vented 3300 gp's. I saw a box of 25 on ebay. http://cgi.ebay.com/25pcs-Li-Ion-Bat...QQcmdZViewItem
for 160 shipped. I dont realy want 25 of them. maybe 16. anywere else to get them?
at that price that puts them at 6.40 a cell.(not bad)
Also. were are you getting the copper jumper bars? I assume they are specificly made to bend in half to make end to end packs. And one last ? since im super dumb on a123 cells(or similar) but it sounds like these cells are a little less sensitive, to overdischarging. and you dont need to balance them like lipos. What amp can you charge them at? 1c? higher? and are you just using a lipo charger set to 4 cells? any reason you couldnt charge 8 of them at one time on something like a mrc 989? thanks guys always looking forward to good info on these boards.

[sikeston34m]

Originally Posted by dubkatz

Very cool and interesting thread. Im always looking for something to replace my old beat up vented 3300 gp's. I saw a box of 25 on ebay. http://cgi.ebay.com/25pcs-Li-Ion-Bat...QQcmdZViewItem
for 160 shipped. I dont realy want 25 of them. maybe 16. anywere else to get them?
at that price that puts them at 6.40 a cell.(not bad)
Also. were are you getting the copper jumper bars? I assume they are specificly made to bend in half to make end to end packs. And one last ? since im super dumb on a123 cells(or similar) but it sounds like these cells are a little less sensitive, to overdischarging. and you dont need to balance them like lipos. What amp can you charge them at? 1c? higher? and are you just using a lipo charger set to 4 cells? any reason you couldnt charge 8 of them at one time on something like a mrc 989? thanks guys always looking forward to good info on these boards.

The Ebay seller you listed is where I purchased these from. He shipped fast and described them well.

I bought a quantity of copper battery bars from Ebay a long time ago. I don't see any flat ones posted now. In the past, I have cut narrow flat strips from a sheet of copper, kinda time consuming but works well also.

1C charge rate is a good rule of thumb for anything lithium ion related.

The charger I use is a MRC Superbrain 989. 8S wouldn't be a problem for it at all.

I still have my bashing packs, but there are alot of other uses for these cells as well.

On a recent trip to Bass Pro Shops, I found this Lantern. Out of the box, it requires 8 D size batteries. The manufacturer claims 10 hours of runtime per set of batteries.

Fishing season is here at last!

I installed 12 of these cells in the lantern in a 4P3S configuration. This provides a total of 10,000mah and around 24 hours of straight runtime per charge. Enough for an entire weekend of camping.

There is also a pcb installed now with a lvc of 2.4 volts per cell to protect the batteries in case I fall asleep or something and accidently leave it on at the end of the charge.

Check this out.

[emaxxracer15]

What are the charge times for these cells?

[suicideneil]

1c charge rate, so about 1 hour at 2.5amps.

you know i just smoked my mm(literaly) so i order a mmm, remebering this thread made me think(also seeing a pic.) of a 6s a123 pack. you could do the same with these cells, would def. weigh more but i cant think of a better cheaper setup than a mmm and running 6s2p of these babies. the only thing that sucks is my 977 will only charge 3s :(
but the list of chargers that would work is plentiful, + i love the fact that you dont have to balance the cells. you run that setup with this motor
http://www.hobbycity.com/hobbycity/s...idProduct=4937
6s would put that at 36-37k rpm. that would be a screamer :P
have to resist, arg. have to use all these gp 3300 i have laying around. i think ill just run my old nimh and 9xl into the ground and then step up.

So hows the testing been going? how many cycles have you gottin on them? Run them thru a mmm yet? and finnaly have you soldered up some 6s packs yet?

[sikeston34m]

Originally Posted by dubkatz

So hows the testing been going? how many cycles have you gottin on them? Run them thru a mmm yet? and finnaly have you soldered up some 6s packs yet?

I've put maybe 10 cycles on my 4S2P setup so far. Everything seems perfect with them.

I have a MMM on the way, but haven't gotten it yet.

No 6S packs yet.

I will probably use the MMM in a Revo with the new chassis design.

Has anyone heard the battery compartment size on the new E Revo?

[BrianG]

In a previous thread, you mentioned the use of an LVC PCB. What are you using for that?

Yea im waiting for my mmm too. Have you had to balance them yet? or are you just running them to lvc, and recharging?
Ohaa thats right i wanted to ask, have you run them on an inrunner yet? or just that outrunner you had on your maxx? Im curious what temps you see on hi amp draws. Im thinking if they hold up to amp draw well. you could run a 6s1p config. Low kv motor, and still have decent run times, while keeping the weight down. Or you could just go all out run 6s2p and run all day

[sikeston34m]

Originally Posted by BrianG

In a previous thread, you mentioned the use of an LVC PCB. What are you using for that?

I robbed one out of a 3S PDA Battery Pack that used Prismatic cells.

Cylindrical cells can handle a lower lvc.

I was looking at purchasing one at this website before I discovered the "freeby" I could just rob from the Pack I had.

http://www.batteryspace.com/index.as...S&Category=711

They have a wide variety of lvc modules. From 1S all the way up to 10S. Most of these really aren't practical for brushless applications since they don't support the kind of amp draw that brushless demands.

Very useful for applications such as the Lantern, since it's current draw is relatively low.

[sikeston34m]

Originally Posted by dubkatz

Yea im waiting for my mmm too. Have you had to balance them yet? or are you just running them to lvc, and recharging?
Ohaa thats right i wanted to ask, have you run them on an inrunner yet? or just that outrunner you had on your maxx? Im curious what temps you see on hi amp draws. Im thinking if they hold up to amp draw well. you could run a 6s1p config. Low kv motor, and still have decent run times, while keeping the weight down. Or you could just go all out run 6s2p and run all day

They are holding their balance well so far, so I've just been discharging and charging.

I haven't ran them on an inrunner setup yet. LOL I'm sure they would do well though. They don't even get warm with my outrunner E maxx.

I may try a 6S1P setup when I get my MMM just to see how well they do.

Also, i have been having a hell of a time finding copper bendable batt bars/strips. I have seen bulk copper all day long in diff. thicknesses. But i have no idea if all copper conducts the same. and how thick. I also saw on ebay battery braid. which im not sure if it would work that well. I think its prob too thick.
thanks

[JERRY2KONE]

Try Tower Hobbies. Duratrax battery bars. I just ordered some last week and they are in stock.

[MetalMan]

I use copper braid intended for use as solder wick as battery braid on my A123 packs, and the stuff works perfectly. It's maybe 1/4" wide and 1mm thick, so I use two strips of it to connect A123 cells together. I have three packs constructed using this stuff.

Originally Posted by JERRY2KONE

Try Tower Hobbies. Duratrax battery bars. I just ordered some last week and they are in stock.

ahh those look perfect, but there discontinued