ambroseliao
100 kW
Not yet. I've got 3 12S packs to build. I bought two of the original OSN kits and then bought one of the new kits.
A123 20AHr Pouch Cell Battery Build & Info Thread
- Thread starter bigmoose
- Start date
megacycle
100 kW
8) be good to see them paced against each other.
999zip999
100 TW
Maybe the nut and bolt kit might take more amps ? All different kits have pro's and con's.
megacycle
100 kW
Yeh maybe good for the mid power jobs.
I fancy the upright clamp OSN kit for my next bike build.
They havnt got back yet, have you got a better email contact, please Ambroseliao.
Keep my expensive 200A+ build for a new 20kW buggy project.
Who are selling the dodgy cells zip?
I fancy the upright clamp OSN kit for my next bike build.
They havnt got back yet, have you got a better email contact, please Ambroseliao.
Keep my expensive 200A+ build for a new 20kW buggy project.
Who are selling the dodgy cells zip?
megacycle
100 kW
Thanks for the contact link.
999zip999
100 TW
I was told by Nancy that they do test before building a pack let me search. Magecycle maybe this can help nancy@osnpower.cn
[12/18/2012 12:07:53 AM] sellbatt: these cells can be easily replaced because of the connection way we use. We mactch all the cells before assembly, including voltage,capacity etc.And the test of the battery pack shows about 19.3-19.5AH for the whole pack
[12/17/2012 9:57:15 PM] sellbatt: Sorry, the quotation is NOT quoted on the grade A cells, they are from USA, but there are some small holes one of the tabs.
[12/17/2012 9:58:08 PM] sellbatt: The price of grade A cells with full tabs is US$32-35pc, we do not have much in stock
They say the cells are checked before they buy.
I'm looking for a good suppiler and triied to open a thread for comments but put the price sheet up first and got moved to the used section so wouldn't get much feed back there.
I also what to hear what's up with those Victpower packs people brought ect.
Victpower was saleing those packs with the long strings of cyclinder cells that dru everybody to learn on E.S. about battery repair.
Looking for a JohnCR and maybe some NMC.
[12/18/2012 12:07:53 AM] sellbatt: these cells can be easily replaced because of the connection way we use. We mactch all the cells before assembly, including voltage,capacity etc.And the test of the battery pack shows about 19.3-19.5AH for the whole pack
[12/17/2012 9:57:15 PM] sellbatt: Sorry, the quotation is NOT quoted on the grade A cells, they are from USA, but there are some small holes one of the tabs.
[12/17/2012 9:58:08 PM] sellbatt: The price of grade A cells with full tabs is US$32-35pc, we do not have much in stock
They say the cells are checked before they buy.
I'm looking for a good suppiler and triied to open a thread for comments but put the price sheet up first and got moved to the used section so wouldn't get much feed back there.
I also what to hear what's up with those Victpower packs people brought ect.
Victpower was saleing those packs with the long strings of cyclinder cells that dru everybody to learn on E.S. about battery repair.
Looking for a JohnCR and maybe some NMC.
megacycle
100 kW
Thanks Ambro & zip for the correct link.
I was contacted before you guys posted.
Hallo OSN and Nancy thank you and welcome.
I was contacted before you guys posted.
Hallo OSN and Nancy thank you and welcome.
999zip999
100 TW
I like to find cells at a good price and not have open the pack up foe repair so where is the balance between cheap 14.50us victpower short tabs ect. and the 70.00 us state side cells ?
megacycle
100 kW
Hi April welcome, sorry i got you confused with Nancy.
999zip999
100 TW
Your folks named you Megacycle and me Zip ?
megacycle
100 kW
Now i'm really :? :lol:
999zip999
100 TW
Check this out.
Edit; sometimes I can download as a pic and sometimes it comes out as a jpg. ?
Edit; sometimes I can download as a pic and sometimes it comes out as a jpg. ?
So it seems Victpower no longer have short tab cells in stock and are selling a full tab for $20.....that seems a little too good to be true , but has anybody had any experience with this latest offer from victpower. They sent me a picture of a cell covered with the all the barcodes etc and Made In USA.......where did those blank cell pictures come from that osn is distributing? Anybody?
izeman
1 GW
i ordered on dec-12, had to wait till dec-25 as they were out of stock, and arrived at customs in austria yesterday. had to send them paypal receipt, as there was no real customs declaration attached. it should arrive today/tomorrow @home. i will tell you what those look like - i hope i won't receive any total garbage 
edit: just realized, i'm DD status now. I just can't remember why i like this letter combination that much *ggg*
edit: just realized, i'm DD status now. I just can't remember why i like this letter combination that much *ggg*
Well, back to the drawing board with my battery pack build. I have not finalized my build since I am still waiting on some wires and connectors. I also planned to replace the masonite sides with polyethylene pieces. However, I couldn't resist testing out the pack so I took it out for another test ride today on my e-bike.
I was intentionally not pedaling to test the capacity of the pack. I only rode about 5.6 miles since it was cold and windy. During one stretch, I rode up a moderate incline for a few minutes at about 6 mph to keep down the wind chill. I was drawing between 20 to 30 amps at that time. When I got home and opened the bike bag that holds the battery pack, I could smell some burnt plastic type of odor.
A close look at the battery pack revealed that I had melted the electrical tape on the positive and negative terminals of the wires to the controller. In the photo, I have already replaced the old tubing with new pieces but left the melted tubing near their original places. The electrical tape fused to the vinyl tubing I used to separate the tabs and left an impression of the bolt head in the vinyl. Fortunately, it did not melt through the vinyl tubing.
The nut and bolt of the negative terminal were discolored from the heat and the masonite actually started to char.
I will be adding an angle bracket to the sides to move the end terminals away from the tabs. I will probably use a thicker piece of aluminum to help as a heat sink since there is no air flow in the pack. So the lesson learned here is that there are thermal issues to be aware of with the build even at less than 30 amp loads and 10 awg wires.
On a positive note, the A123 cells with the short tabs are doing well. I rode 13.8 miles and used up 11.5ah over hilly terrain with no pedaling and averaging 9 mph. I started with a pack voltage of 41.2v and still have 39.4v left. The cells are also in balance after being discharged even though the starting bulk charge left the cells with as much as 0.13v deviation.
I was intentionally not pedaling to test the capacity of the pack. I only rode about 5.6 miles since it was cold and windy. During one stretch, I rode up a moderate incline for a few minutes at about 6 mph to keep down the wind chill. I was drawing between 20 to 30 amps at that time. When I got home and opened the bike bag that holds the battery pack, I could smell some burnt plastic type of odor.
A close look at the battery pack revealed that I had melted the electrical tape on the positive and negative terminals of the wires to the controller. In the photo, I have already replaced the old tubing with new pieces but left the melted tubing near their original places. The electrical tape fused to the vinyl tubing I used to separate the tabs and left an impression of the bolt head in the vinyl. Fortunately, it did not melt through the vinyl tubing.
The nut and bolt of the negative terminal were discolored from the heat and the masonite actually started to char.
I will be adding an angle bracket to the sides to move the end terminals away from the tabs. I will probably use a thicker piece of aluminum to help as a heat sink since there is no air flow in the pack. So the lesson learned here is that there are thermal issues to be aware of with the build even at less than 30 amp loads and 10 awg wires.
On a positive note, the A123 cells with the short tabs are doing well. I rode 13.8 miles and used up 11.5ah over hilly terrain with no pedaling and averaging 9 mph. I started with a pack voltage of 41.2v and still have 39.4v left. The cells are also in balance after being discharged even though the starting bulk charge left the cells with as much as 0.13v deviation.
sendler2112
100 kW
I like the simple and serviceable clamp build of your battery. It seems like your motor is a bit hungry. 33 Wh/mile for 9 mph?
megacycle
100 kW
That's weird for 20-30A draw to get that happen.
How was the controller connected to the pack?.
How was the controller connected to the pack?.
megacycle
100 kW
Just realised how that's connected, your end tabs are clamped to your masonite end plates 
.
Good way to smoke your pack.
Said it a few times building packs with flammable kit, risky bizz, bolting current carrying bits to flammables double that risk.
.Good way to smoke your pack.
Said it a few times building packs with flammable kit, risky bizz, bolting current carrying bits to flammables double that risk.
Michall2008
10 mW
Hi,
Finally got my CAV3 in the mail today this thing is huge. All so got 36v/400w bulbs, 2 of those.
Check out my 900W flashlight
After about one minute i stop the test because the wooden suffice the bulbs was mounted on started to smoke
got to figure out how to mount those safely, any ideas ?
There is a huge spark when i connect the 4mm bullet connectors, how do I get rid of it ?
Michael
Finally got my CAV3 in the mail today
this thing is huge. All so got 36v/400w bulbs, 2 of those.Check out my 900W flashlight
After about one minute i stop the test because the wooden suffice the bulbs was mounted on started to smoke
got to figure out how to mount those safely, any ideas ?
There is a huge spark when i connect the 4mm bullet connectors, how do I get rid of it ?
Michael
999zip999
100 TW
33wh is 30mph on my 2810 at 30 amps ? Don't understand that burn on the termanials. Is it loose or arching ?
dnmun
1 PW
he used steel bolts, used the masonite as part of the structural clamping of the terminal, he may even have used a steel lug on the other side. who knows.
izeman
1 GW
i received my 42 cells today. packaging was quite nice. nothing to complain about.
cells don't look that nice. like being ripped out of something with pure power. at least the tabs look like that. some cells also have this funny 900mah sticker - which i don't believe.
i started measuring them. only the first cells, because if got to leave now. all of them have 3.295v. that's fine.
but now for the bad: internal resistance at that voltage measure with my icharger 206b was between 21 and 44 mOhm. that seems WAY to much - isn't? that should be below 5 mOhm afaik. can anyone confirm?
i will post pictures and detailed discharge charts asap.
cells don't look that nice. like being ripped out of something with pure power. at least the tabs look like that. some cells also have this funny 900mah sticker - which i don't believe.
i started measuring them. only the first cells, because if got to leave now. all of them have 3.295v. that's fine.
but now for the bad: internal resistance at that voltage measure with my icharger 206b was between 21 and 44 mOhm. that seems WAY to much - isn't? that should be below 5 mOhm afaik. can anyone confirm?
i will post pictures and detailed discharge charts asap.