Headway 38120s 9ah 10c lifepo4

[BAH48]

Has anybody bought any of theses cells? BMS have them for about £7.25.

38120S 10C C-Rate 9Ah LiFePO4 Cylindrical Battery Cell with Screws Specification:
1. Normal Voltage:3.2Volts.
2. Dimension:diameter(mm) X High(mm) = 38±1mm X 122±1mm(132±1mm).
3. Capacity: 9Ah.
4. Maximal Charge Current: 5C(50Amps).
5. Maximal Continuous Discharge C-Rate: 10C(100Amps).
6. Maximal Discharge C-Rate: 15C(150Amps).
7. Overvoltage Protection: 3.65±0.05Volts.
8. Undervoltage Protection: 2.0Volts.
9. Lifecycle: 2000Cycles.
10. Weight: 330Grams.
11. Impedance: ≤10mΩ.
12. Chemical: LiFePO4.

 

[muckymits]

I have some 12 Ah but bought them in UK (Newcastle) to save the hassle of duty etc. The bike pulls like a train and not that much heavier than my LiPo.

 

[jerrysimon]

Muckymits surely the Headways are MUCH heavier than lipos ?

They are also very big.

Regards

Jerry

 

[muckymits]

yes certainly bigger as you need the extra cell, will weigh them tomorrow as I cant find any of the scales, they must all be in the potting shed.

 

[morphix]

Muckymits surely the Headways are MUCH heavier than lipos ?

They are also very big.

Regards

Jerry

Maybe his bike Weighs a ton anyway ;-) Jerry I'm going totake your title as lightest folder

 

[muckymits]

Maybe his bike Weighs a ton anyway ;-)

Dont you start have a bad enough time with Funky and Flecc

 

[BAH48]

"I have some 12 Ah but bought them in UK (Newcastle)"

Hi mm,

Where in Newcastle?

 

[Deleted member 4366]

I have this battery, which contains them:
36V10Ah LiFePO4 Battery 38120 Battery Pack with Carrier - BMSBATTERY
It's relatively heavy for its size as are all Headways. Using it with my GNG crank drive at 25amps, I get cut-outs after about 10 seconds of full throttle. No sign of significant sag on LEDs so It might be a BMS problem - temperature or current. I don't get cut-outs with lipos, so definitely the battery.

For the same weight, size and more or less the same money, I got a 20aH LiNiCoMn battery that can provide more current and go a lot further.

 

[BAH48]

OK, thanks d8veh, just trying to get my head round this battery technology.

 

[oigoi]

Has anybody bought any of theses cells? BMS have them for about £7.25.

38120S 10C C-Rate 9Ah LiFePO4 Cylindrical Battery Cell with Screws Specification:
1. Normal Voltage:3.2Volts.
2. Dimension:diameter(mm) X High(mm) = 38±1mm X 122±1mm(132±1mm).
3. Capacity: 9Ah.
4. Maximal Charge Current: 5C(50Amps).
5. Maximal Continuous Discharge C-Rate: 10C(100Amps).
6. Maximal Discharge C-Rate: 15C(150Amps).
7. Overvoltage Protection: 3.65±0.05Volts.
8. Undervoltage Protection: 2.0Volts.
9. Lifecycle: 2000Cycles.
10. Weight: 330Grams.
11. Impedance: ≤10mΩ.
12. Chemical: LiFePO4.

I have the 10ah ones that I got from here:

eclipsebikes.com| bikes | electric bike kits | Pedal | Power

And they have been reliable and seem to have a decent capacity and long lifespan (lots of cycles) thought there are lighter battery options out there.

I also like the way it is easy to measure individual cell voltages and change one cell if it does go duff in the future

 

[BAH48]

OK, oigoi, thanks for your info.

 

[muckymits]

Muckymits surely the Headways are MUCH heavier than lipos ?

They are also very big.

Regards

Jerry

10AH LiPo is 2.8k and 12AH Headway is 3.4k

Finally found some scales

 

[Deleted member 4366]

10AH LiPo is 2.8k and 12AH Headway is 3.4k

Finally found some scales

Not sure that you got that right with the Headways. Mine's over 5kg without a case.
36V 12Ah 38140 LiFePO4 Battery 12 Cells EBike Battery Pack - BMSBATTERY

 

[muckymits]

Dave they are only 24 volt