Step charging and IB3800's
#1
Step charging and IB3800's
For 19 and stock touring.....has step charging seen any advantages over regular charging? thanx.
#4
Tech Initiate
Step charging is not needed for IB cells.
#5
Tech Apprentice
Originally Posted by Hagberg
Step charging is not needed for IB cells.
Step charging is keeping the cell temp down.
#7
I just did a simple test. I have two packs of IB3800 and I cycled them two times. The first time with step charge at 7A > 0.5A > 6.5A and the second time with 6a linear. I charge and discharge both pack with the ICE charger.
The numbers on the label are:
Voltage IR Runtime
1.198 2.0 399s
1.199 2.0 398s
1.198 2.0 398s
1.199 2.0 399s
1.199 2.0 399s
1.199 2.0 399s
The result is that with 6a linear charge, the pack have a higher Average volt and a lower IR.
Here are the numbers:
-------- Pack1 Pack2 (step charge 5mv)
AvG Volt 7.350 7.328
Resistence 29 27
-------- Pack1 Pack2 (6a linear 5mv)
AvG Volt 7.382 7.415
Resistence 28 27
With step charge, the peak temp of the battery is around 110 ~ 115F
With linear charge, the peak temp is around 120~122F
Both peaked with about the same capacity, around 4200mah
After first cycle, I discharge the rest of the pack on the team wave discharger until 0.9v per cell and store them until the next cycle. I then discharge them again on the team wave to 0.9v before I charge them again.
The numbers in the test might not be very accurate, but at least we could look at them and compare.
The numbers on the label are:
Voltage IR Runtime
1.198 2.0 399s
1.199 2.0 398s
1.198 2.0 398s
1.199 2.0 399s
1.199 2.0 399s
1.199 2.0 399s
The result is that with 6a linear charge, the pack have a higher Average volt and a lower IR.
Here are the numbers:
-------- Pack1 Pack2 (step charge 5mv)
AvG Volt 7.350 7.328
Resistence 29 27
-------- Pack1 Pack2 (6a linear 5mv)
AvG Volt 7.382 7.415
Resistence 28 27
With step charge, the peak temp of the battery is around 110 ~ 115F
With linear charge, the peak temp is around 120~122F
Both peaked with about the same capacity, around 4200mah
After first cycle, I discharge the rest of the pack on the team wave discharger until 0.9v per cell and store them until the next cycle. I then discharge them again on the team wave to 0.9v before I charge them again.
The numbers in the test might not be very accurate, but at least we could look at them and compare.
#8
Originally Posted by lookinco
I just did a simple test. I have two packs of IB3800 and I cycled them two times. The first time with step charge at 7A > 0.5A > 6.5A and the second time with 6a linear. I charge and discharge both pack with the ICE charger.
The numbers on the label are:
Voltage IR Runtime
1.198 2.0 399s
1.199 2.0 398s
1.198 2.0 398s
1.199 2.0 399s
1.199 2.0 399s
1.199 2.0 399s
The result is that with 6a linear charge, the pack have a higher Average volt and a lower IR.
Here are the numbers:
-------- Pack1 Pack2 (step charge 5mv)
AvG Volt 7.350 7.328
Resistence 29 27
-------- Pack1 Pack2 (6a linear 5mv)
AvG Volt 7.382 7.415
Resistence 28 27
With step charge, the peak temp of the battery is around 110 ~ 115F
With linear charge, the peak temp is around 120~122F
Both peaked with about the same capacity, around 4200mah
After first cycle, I discharge the rest of the pack on the team wave discharger until 0.9v per cell and store them until the next cycle. I then discharge them again on the team wave to 0.9v before I charge them again.
The numbers in the test might not be very accurate, but at least we could look at them and compare.
The numbers on the label are:
Voltage IR Runtime
1.198 2.0 399s
1.199 2.0 398s
1.198 2.0 398s
1.199 2.0 399s
1.199 2.0 399s
1.199 2.0 399s
The result is that with 6a linear charge, the pack have a higher Average volt and a lower IR.
Here are the numbers:
-------- Pack1 Pack2 (step charge 5mv)
AvG Volt 7.350 7.328
Resistence 29 27
-------- Pack1 Pack2 (6a linear 5mv)
AvG Volt 7.382 7.415
Resistence 28 27
With step charge, the peak temp of the battery is around 110 ~ 115F
With linear charge, the peak temp is around 120~122F
Both peaked with about the same capacity, around 4200mah
After first cycle, I discharge the rest of the pack on the team wave discharger until 0.9v per cell and store them until the next cycle. I then discharge them again on the team wave to 0.9v before I charge them again.
The numbers in the test might not be very accurate, but at least we could look at them and compare.
However, I also tried linear charges of 6.0A, 6.2A and 6.5A. At 6.5A, the voltage and runtime went down when compared to the 6.0A charge. But at 6.2A, the voltage went up a little with not much dropoff in runtime or change in IR from the 6.0A charge.
#9
Tech Apprentice
wo ...thx guys~!~~
those really a gd reference ar!!!
anyone tried for GP cells?
i just get 5 packs of GP3700~~
those really a gd reference ar!!!
anyone tried for GP cells?
i just get 5 packs of GP3700~~
#10
Tech Elite
iTrader: (10)
Originally Posted by teamgp
However, I also tried linear charges of 6.0A, 6.2A and 6.5A. At 6.5A, the voltage and runtime went down when compared to the 6.0A charge. But at 6.2A, the voltage went up a little with not much dropoff in runtime or change in IR from the 6.0A charge.
#11
Originally Posted by jamescam
Any heat problems charging at 6.2A? What peak detect did you use?
#12
Tech Apprentice
Originally Posted by lookinco
The first time with step charge at 7A > 0.5A > 6.5A and the second time with 6a linear.
#13
On the ICE, the step charge function is very flexible. There are 4 stage that you could choose and is adjustable in every 100mah increments.
I used 7a > 0.5a > 6.5a because that is what in most step charging profile for the IB3800, including the Hara profile for the much more charger.
I used 7a > 0.5a > 6.5a because that is what in most step charging profile for the IB3800, including the Hara profile for the much more charger.
#14
Tech Apprentice
@lookinco: what was the time in days/hours/minutes to the next charge ?
My experiences are that the IB cells have better numbers on the second charge off the day !! whatever charge method in use
My experiences are that the IB cells have better numbers on the second charge off the day !! whatever charge method in use