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| Anchor | ||||
|---|---|---|---|---|
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Circuit
Capacity Test
Capacity | Expected | Actual | Percentage |
|---|---|---|---|
| Ah | 9 Ah | 9.24 Ah | 103% |
| Wh | 324 Wh | 334 Wh | 103% |
Battery Rebuild
Testing
Testing the cells showed that they were within spec.
| Cell 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|
| 3.957 | 3.959 | 3.966 | 3.968 | 3.975 | 3.969 | 3.979 | 3.985 | 3.977 | 3.988 |
I decided to disassemble the battery and test every cell. They appear to be fine. Capacity tests results were good.
When disassembling the battery, I noticed a wire with exposed copper. I assumed I hit it with the razor blade when taking it apart but it may have pre-existed.
Ordered a new Smart BMS with Bluetooth which might help diagnose future issues.
See Bluetooth BMS.
Repacking
Bluetooth BMS
aliexpress.com - C$23.63
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Attention
(1)All smart bms support xiaoxiangElectric App IOS and Android version to convert li-ion and lifepo4 parameters.
(2)All smart bms has BT and UART function.
(3)Smart BMS accessories needs buy separately:https://www.aliexpress.com/item/3256804529002284.html
(4)All UART communication can be converted to Canbus communication if needed,
only need to buy a canbus module converter separately.
(5)APP Manual and BMS Specification:pls contact customer service.
Circuit
Initial Replacement BMS
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Wiring
When wiring the BMS monitoring lines, connect the extras to positive. See above picture.
BMS Settings
Capacity Test
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Capacity
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Expected
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Actual
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Percentage
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Rebuild Pictures
I also designed and printed some replacement battery casing gaskets in order to prevent water intrusion.
See House 3D Prints#E-BikeBatteryGasket
Seems to be working! Fingers crossed.
Motor Controller
Specifications
| Specification | Value |
|---|---|
| Product Number | JDW41-2 |
| Voltage | 36V |
| Max Current | 15 A |
| Rated Current | 7 A |
| Low Voltage Protection | 31.5 V |
| Throttle Adjustment Voltage | 1.2 - 4.4 V |
| Width | 2 3/8" or 60.3 mm |
| Length | 3 1/2" or 88.9 mm |
| Height | 1 3/4" or 44.5 mm |
Pictures
Wiring
| Wire# | No. Wires | Wire Colors | Purpose |
|---|---|---|---|
| 0 | 3 | Green, Yellow, Blue | Motor |
| 1 | 3 | Red, Green, Yellow | HALL - Wheel Speed Sensor |
| 2 | 3 | Red, Blue, Black(GND) | PAS - Pedal Assist Sensor |
| 3 | 2 | White, Yellow | Brakes |
| 4 | 2 | White, Yellow | Brakes |
| 5 | 3 | Purple, Grey, Black(GND) | Peddle Assist Switch |
| 6 | 3 | Red(5v), Green, Black(GND) | Throttle |
| 7 | 2 | Orange, Brown | Voltage Monitor? - NOT Used |
| 8 | 1 cable - 5 wires? | Black | Display? - Not Used |
| 09 | 2 | Red, Black | Battery Power |
...
The battery would turn off when pulling higher currents. If I was easy on the throttle, I could get it to stay on.
Testing the cells showed that they were within spec.
...
I decided to disassemble the battery and test every cell. They appear to be fine. Capacity tests results were good.
When disassembling the battery, I noticed a wire with exposed copper. I assumed I hit it with the razor blade when taking it apart but it may have pre-existed.
Ordered a new Smart BMS with Bluetooth which might help diagnose future issues.
See Bluetooth BMS.
Rebuild Pictures
I also designed and printed some replacement battery casing gaskets in order to prevent water intrusion.
See House 3D Prints#E-BikeBatteryGasket
Seems to be working! Fingers crossed.
References
| Reference | URL |
|---|---|
| F4W Peak 350W electric bike | https://www.f4wbikes.com/#!peak/cee5 |
| F4W (Fast4ward) Peak 350W Electric Bike Review | https://electricbikereport.com/f4w-fast4ward-peak-350w-electric-bike-review/ |
| Details | https://www.greenfinder-mobility.com/e-bikes/brand/fast4ward/#/product_preview/1375 |
| Review | https://www.youtube.com/watch?v=1bcUQ2ykW_M |
| How to install a Brushless DC Controller on Ebike: The missing manual | https://www.youtube.com/watch?v=PuwnFMHHtaE |
| Increase speed of ebike: Swagtron EB5 controller upgrade | https://www.youtube.com/watch?v=QbsPzjG-QpA |