The downsides to this upgrade are loss of battery dash info, and the battery is mounted permanently rather than having a quick release like the original.
The benefits are:
- Longer range (50+miles)
- Safer and higher quality cells (cylindrical instead of LiPo pouch)
- Thermal pads for better thermal management
- Cell level monitoring and protection via the Bluetooth BMS
- Active cell balancing
- High AND low temperature protection for charging and discharging
When installing the upgraded battery I recommend using the app to turn off the “Charge” and “Discharge” functions. Then plug in the large red power plug, then the smaller circle aviation plug. Then turn on the “Charge” and “Discharge” switches in the app and the battery will be armed. This process is to prevent sparking at the terminals.
Once the battery is connected, charge it fully, then turn off the “Charge” and “Discharge” functions again for at least 30 seconds. Then turn them on again. This is done so that the motor controller will “wake up” with the highest voltage the pack can deliver and consequently increase top speed to 52mph.
The range from this battery pack is a minimum of 50 miles. That was the distance achieved with aggressive riding, at mostly full throttle, with a 170lb rider. The last 5 miles will be quite sluggish, with a top speed around 25mph. A phone can be mounted to the handlebars if you want to monitor the battery info while riding.
The best Apps to monitor battery details over Bluetooth are BAT-BMS, and XiaoXiang-Electric. I have already adjusted the protection parameters and capacity settings, but if you would like to adjust those then I recommend the Overkill Solar app, as the first two apps are mostly for monitoring. These all work fine on Android, but I have not personally tested them on an iPhone.
The battery is water resistant, but not waterproof. It will be fine in regular use and riding through rain, but don’t submerge it or spray it down with a hose.
Watch the Battery Installation Video Here
Cell Specifications:
- Manufacturer: LG
- Model: INR21700-M50LT
- Size: 21700
- Positive Terminal: Flat Top
- Nominal Capacity: 5000mAh
- Continuous Discharge Rating (max): 14.4A
- Nominal Voltage: 3.6V
- Maximum Voltage: 4.2V
- Discharge cut-off Voltage: 2.5V
- Protected: No
- Rechargeable: Yes
- Approx. Dimensions: 21.10mm x 70.20mm
- Approx. Weight 67.8g
Assembled Pack Specs:
- These cells were previously used (No charge port on battery option) , but are measuring at Least 4,900 mAh per cell, 98% of the rated capacity.
- Configuration: 20s11p / 72V / 52Ah / 3,744Wh
- All battery spot welds are from the factory (no DIY welds)
- High-power cables have bolted or crimped connections
- Dual 10awg cables are used instead of a single 10awg cable like the OEM battery
- Thermal pads are between the cells and metal enclosure to help keep the battery cool
- BMS: Jiabaida (JBD) Smart BMS 20S 72V 60A Li-ion Battery Protection Module
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