GBP Battery Co / 48V 20Ah Li-ion

[marty]

If it read a flat zero then the BMS may have shut it down.

Duh.... Now I understand. Thanks for explaining that to me. Do wish I knew the voltage when BMS shut down? CBA would be nice.

[Yesa-battery]

Hello,marty,

48V 20AH li-ion battery (13 cells) ,

48/13=3.7V

So the battery is not LiFePO4 , LiFePO4 cell should be 3.2V , maybe LiMn2O4. Just guess, not sure.

[marty]

Hello Mr William, Yesa-battery Man,
You can call my battery LiMn2O414789632?????? if you want? Just to let it be known. I call my battery, Marty-Battery. Model Li1. My battery is number one!

Would like to see some pictures of your battery. Naked please. Tear off that shrink wrap! I show you mine. Now show me yours. Please start a new topic. Click on button that say [new topic] Tell us all about your batteries? I like to look at pictures. Do you have 48V 20Ahr? What is size weight? What is price? Got pictures of charger? Got any colorful graphs?

[fechter]

Yes, please show us the insides.
Show us the factory where they are made.
Show us test results
Tell us how much they cost and what sizes are available.

and on and on....

You can post pictures on the forum by using the browse and Add Attachment buttons under the text box.

[marty]

Yes, please show us the insides.
Show us the factory where they are made.
Show us test results
Tell us how much they cost and what sizes are available.

and on and on....

You can post pictures on the forum by using the browse and Add Attachment buttons under the text box.

Here's your pictures Fechter. Only took me 5 years to upload these. I've been busy. Sorry about that.

48V_20Ah 001_side.jpg (63.81 KiB) Viewed 268 times

48V_20Ah 002_top.jpg (78.1 KiB) Viewed 268 times

48V_20Ah 003_ruler.jpg (55.86 KiB) Viewed 268 times

4

48V_20Ah_bms.jpg (65.25 KiB) Viewed 268 times

48V_20Ah 004_scale.1.jpg (58.47 KiB) Viewed 268 times

6

48V_20Ah 005_scale.2.jpg (52.03 KiB) Viewed 268 times

48V_20Ah 006_charger.1.jpg (51.15 KiB) Viewed 268 times

48V_20Ah 007_charger.2.jpg (65.1 KiB) Viewed 268 times

[fechter]

Well, then you should have long term test results by now

I love the rusty scale!

[cwah]

My battery (Limn2O4 or Li(NiCoMn)O2) has lost 40% of its capacity in 6 months.

Have done around 70-100 cycles on it.

[nechaus]

Thats some nice old looking scales.

[Kin]

My battery (Limn2O4 or Li(NiCoMn)O2) has lost 40% of its capacity in 6 months.

Have done around 70-100 cycles on it.

That's insanely high. What C rating are you running it at? Does the pack get hot after using it?

[cwah]

Yeah, that's really bad. I'm only running at 1.2C rating continuous.

Not very high.. Very often I leave my bike outside, on the cold (0 Celcius outside) and the heat (25 Celcius outside). Maybe sometime the sunlight damaged the batteries as the decay is extremely fast over 50 Celcius. I can't tell thought.

[Hugues]

I compared the 100ah type of GBP to a Winston cell,
Winston comes out much better in term of energy density in weight and volume.

[Ypedal]

I got 2 of the 36v 20ah packs made from these cells just about the same time Marty got his ( a few months before ) .

I just ran a capacity test on one of the 2 packs ( I've let a local friend use it for the last 2 years. )

I fully charged the pack, cell by cell to 4.20v via the ballance leads. let sit overnight..

cell no.9 of 10 is bad from day 1.. had a big dent in it on arrival.. falconev was not honoring any warranties so it's been used as is since..

I got 8.0 ah before cell.9 dropped to 3.1v, all other cells holding 3.6v ..

Marty, are you using that pack ?

[marty]

Bought this battery for Electric Bike Project #2. This is one of my unfinished projects. Hope to complete it real soon.

Back in 2007 I charged and discharged a few times. After that battery just sat. Now the charger that came with battery will not charge. I charged each cell separately with Hyperion EOS 1420i NET3 Charger. Cell number 8 is dead and swollen. Cell number 7 is swollen a little on the bottom.

I need to buy 2 cells. Ypedal, do you got any cells for sale?

Test with CBA III - Computerized Battery Analyzer
Attached please see PDF file 48V_20Ah_test1

48V_20Ah_test1.pdf

(74.17 KiB) Downloaded 7 times

cel01:
Description: 1 Li-ion cell, 20.0 Ah @ 20.00A
Started At: 4/15/2012 9:44 PM
Discharge Rate: 20.00 A
Starting Voltage: 4.00 V
Ending Voltage: 2.80 V
Total Time (hh:mm:ss): 00:31:06
Tested Capacity: 10.423 Ah

cel02:
Description: 1 Li-ion cell, 20.0 Ah @ 20.00A
Started At: 4/15/2012 10:34 PM
Discharge Rate: 20.00 A
Starting Voltage: 4.00 V
Ending Voltage: 2.80 V
Total Time (hh:mm:ss): 00:40:47
Tested Capacity: 13.665 Ah

cel03:
Description: 1 Li-ion cell, 20.0 Ah @ 20.00A
Started At: 4/16/2012 7:49 AM
Discharge Rate: 20.00 A
Starting Voltage: 4.00 V
Ending Voltage: 2.80 V
Total Time (hh:mm:ss): 00:37:04
Tested Capacity: 12.419 Ah

cel04:
Description: 1 Li-ion cell, 20.0 Ah @ 20.00A
Started At: 4/16/2012 8:40 AM
Discharge Rate: 20.00 A
Starting Voltage: 4.02 V
Ending Voltage: 2.80 V
Total Time (hh:mm:ss): 00:39:54
Tested Capacity: 13.369 Ah

cel05:
Description: 1 Li-ion cell, 20.0 Ah @ 20.00A
Started At: 4/16/2012 9:39 AM
Discharge Rate: 20.00 A
Starting Voltage: 4.00 V
Ending Voltage: 2.80 V
Total Time (hh:mm:ss): 00:35:20
Tested Capacity: 11.837 Ah

cel06:
Description: 1 Li-ion cell, 20.0 Ah @ 20.00A
Started At: 4/16/2012 5:57 PM
Discharge Rate: 20.00 A
Starting Voltage: 3.97 V
Ending Voltage: 2.80 V
Total Time (hh:mm:ss): 00:34:23
Tested Capacity: 11.519 Ah

cel07:
Description: 1 Li-ion cell, 20.0 Ah @ 20.00A
Started At: 4/16/2012 6:43 PM
Discharge Rate: 20.00 A
Starting Voltage: 4.02 V
Ending Voltage: 2.80 V
Total Time (hh:mm:ss): 00:27:54
Tested Capacity: 9.344 Ah

cel08:


cel09:
Description: 1 Li-ion cell, 20.0 Ah @ 20.00A
Started At: 4/16/2012 8:18 PM
Discharge Rate: 20.00 A
Starting Voltage: 3.99 V
Ending Voltage: 2.80 V
Total Time (hh:mm:ss): 00:31:22
Tested Capacity: 10.507 Ah

cel10:
Description: 1 Li-ion cell, 20.0 Ah @ 20.00A
Started At: 4/16/2012 8:57 PM
Discharge Rate: 20.00 A
Starting Voltage: 4.03 V
Ending Voltage: 2.80 V
Total Time (hh:mm:ss): 00:44:16
Tested Capacity: 14.833 Ah

cel11:
Description: 1 Li-ion cell, 20.0 Ah @ 20.00A
Started At: 4/17/2012 8:48 AM
Discharge Rate: 20.00 A
Starting Voltage: 4.01 V
Ending Voltage: 2.80 V
Total Time (hh:mm:ss): 00:34:38
Tested Capacity: 11.602 Ah

cel12:
Description: 1 Li-ion cell, 20.0 Ah @ 20.00A
Started At: 4/17/2012 9:34 AM
Discharge Rate: 20.00 A
Starting Voltage: 3.99 V
Ending Voltage: 2.80 V
Total Time (hh:mm:ss): 00:34:42
Tested Capacity: 11.625 Ah

cel13:
Description: 1 Li-ion cell, 20.0 Ah @ 20.00A
Started At: 4/18/2012 8:36 AM
Discharge Rate: 20.00 A
Starting Voltage: 4.01 V
Ending Voltage: 2.80 V
Total Time (hh:mm:ss): 00:39:18
Tested Capacity: 13.168 Ah

[heathyoung]

You could run it as a 12S, just need to determine if the BMS can be reconfigured. Most of the people running LIPO are counting 12S at 44V.

Your pack is also only as strong as the weakest cell - so you have a 10AH pack now.

[Ypedal]

Well.. i'm either making a 9S pack from mine if the rest will deliver 15+ ah, but if the remaining cells follow the capacity curve of yours and i cant get more than 13ah from a 20ah cell.. it's retirement time... if that's the case you can have anything i retire !!