Specifications

SpecificationDetails
ManufacturerHero Eco - https://heroeco.com/
Bike Web Sitehttps://www.f4wbikes.com
ModelFAST4WARD Peak
Model Year2012
Price$1,799 USD
CategoryMountain Bike / ATB | -
eBike TypePedelec | up to 20 mph
Frame typemale
Frame size,
Weight46 lbs
Range37 miles * (60km)
Engine
Engine Positionrear hub
Engine Power250 Watt
Assists until20 mph
Battery TypeLithium-Ion
Battery Characteristics324.00 Wh / 9.00 Ah / 36.00 V
Range37 miles  (60km)
Gearshift/Brakes
Gearshift Typederailleur
Gears8
Gearshift BrandShimano Alivio
Brakes TypeV-Brake
Suspension
Suspension front/rearYes / No
Tires
Size26 x 1.75


Battery

Sony 36V 9Ah Lithium Ion 324 Watt Battery 

10s4p 2.25Ah Lion


Capacity Test

CapacityExpectedActualPercentage
Ah9 Ah2.6 Ah29%
Wh324 Wh93 Wh29%



Disassembly





 

New Battery

Configuration

10s4P



Layout


Rebuilding the Battery


New BMS

Max Housing Size - 100mmx65mm


Current BMS


Circuit


Capacity Test


Capacity

Expected

Actual

Percentage

Ah9 Ah9.24 Ah103%
Wh324 Wh334 Wh103%


Battery Rebuild 

Why?

The battery kept shutting off a lot. Seemed to be happening when pulling a large amount of current. Must be a battery/bms issue.


Testing the cells showed that they were within spec. 

Cell 12345678910
3.9573.9593.9663.9683.9753.9693.9793.9853.9773.988

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. 

Repacking

Bluetooth BMS

aliexpress.com - C$23.63


JBD Smart BMS-SP17S005 is a software protection board scheme specially designed
for 10~17series lithium battery packs.The whole system adopts concave convex front-end
acquisition chip

+ Bluetooth MCU scheme, and some parameters can be flexibly adjusted through
the uppercomputer according to the needs of customers.

The Smart BMS Automatically Identify Lithium Battery Strings From 10S To 17S.
Size:102*65*12mm.
Applicable Battery Type: 3.2v Lifepo4 & 3.7v Li-ion Battery Pack.
Package Included:BMS with built-in BT*Balance Wires

Function Introduction
(1)BT-APP in Phone-xiaoxiangElectric App:http://www.jiabaida.com/appdown/index.html
Support Both IOS version and Android version, can monitor and change the parameters.
(2)PC Tool Software: https://jbdtools.oss-cn-beijing.aliyuncs.com/packfile/JBDTools.zip
(3)UART LCD Displayer-Can monitor parameters on LCD display.

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.


Wiring

When wiring the BMS monitoring lines, connect the extras to positive. See above picture.


BMS Settings

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

SpecificationValue
Product NumberJDW41-2
Voltage36V
Max Current15 A
Rated Current7 A
Low Voltage Protection31.5 V
Throttle Adjustment Voltage1.2 - 4.4 V


Width2 3/8" or 60.3 mm
Length3 1/2" or 88.9 mm
Height1 3/4" or 44.5 mm

Pictures



Wiring

Wire#

No. Wires

Wire ColorsPurpose
03

Green, Yellow, Blue

Motor 
13Red, Green, YellowHALL - Wheel Speed Sensor
23Red, Blue, Black(GND)PAS - Pedal Assist Sensor
32White, YellowBrakes
42White, YellowBrakes
53Purple, Grey, Black(GND)Peddle Assist Switch
63Red(5v), Green, Black(GND)Throttle 
72Orange, BrownVoltage Monitor? - NOT Used
81 cable - 5 wires?BlackDisplay? - Not Used
092Red, BlackBattery Power


Internals


Wires Going to Display/Controller (No longer used)


Wire#Color->Wire#ColorUsage
1 (HALL)Green
8BlueSpeed Display?
7Orange
8Green?
7Brown
8Yellow?
BOARDRed (36V)
8RedPower
BOARDBlack (GND)
8BlackPower


Issues

Power Turns Off When Driving

Sometimes while driving the power turns off. Toggling the power switch fixes the issue and we can continue along.

Thoughts:

  • Could be a loose connection that gets jiggled when hitting bumps. 

Observations:

  • Noticed that the ground connector at the base of the battery was not very tight. Compressed the connections to ensure that they connect better when attached to the bike.


  • Performing capacity test to see if the battery is ok.

  • Capacity test resulted with a battery capacity of 8.67Ah. Looks good.


Power Turns Off When Driving - Hapens A Lot

The battery would turn off when pulling higher currents. If I was easy on the throttle, I could get it to stay on.

Decided to rebuild the battery. See above.


References

ReferenceURL
F4W Peak 350W electric bikehttps://www.f4wbikes.com/#!peak/cee5
F4W (Fast4ward) Peak 350W Electric Bike Reviewhttps://electricbikereport.com/f4w-fast4ward-peak-350w-electric-bike-review/
Detailshttps://www.greenfinder-mobility.com/e-bikes/brand/fast4ward/#/product_preview/1375
Reviewhttps://www.youtube.com/watch?v=1bcUQ2ykW_M
How to install a Brushless DC Controller on Ebike: The missing manualhttps://www.youtube.com/watch?v=PuwnFMHHtaE
Increase speed of ebike: Swagtron EB5 controller upgradehttps://www.youtube.com/watch?v=QbsPzjG-QpA