Understanding Battery ReadoutsUpdated 19 hours ago
These are the standard readouts from the battery management system (BMS)—viewable in the info section on the Bafang display. Here’s what each one actually means in plain terms:
How to access Battery Details on the Bafang C080 display
View Battery Details
- Battery Software / Hardware Version and Status Information
- Press (+) and (-) for at least 2 seconds to enter the "Setting" mode
- Press (+) or (-) to select "Information"
- Press the "Power button" to enter "Information" mode
- Press (+) or (-) to select "Battery Info"
- Press the "Power button" to enter "Battery Info" mode
- Press (+) or (-) to select "→"
- Press the "Power button" to confirm your selection
- Press the "Power button" to scroll through the "Battery Info" screens
- Press (+) and (-) for at least 2 seconds to return to the main screen
- Or press (+) or (-) to select "Back", then press the "Power Button" to return to "Battery Info". Then select "Exit" and press the "Power button" to confirm.
- Note: Battery info is for reference only and cannot be modified
🔧 System Info
- SW (Software)
Version of the BMS firmware controlling the battery. - HW (Hardware)
Version or revision of the physical BMS board.
🌡️ Battery Condition
- Temp (°C)
Current battery temperature.- Normal range when being charged: 32°F ~ 113°F (0°C ~ 45°C)
- Normal range when being ridden: 4°F ~ 140°F (-20°C ~ 60°C)
- Too high = risk of damage or shutdown
- Too low = reduced performance
⚡ Voltage & Current
- TotalVolt (mV)
Total battery pack voltage in millivolts (mV).- Example: Bafang 48V x 10.5 Ah Battery (used on the Sun E350 Trike)
- Total capacity is 54.6 volts (V) or 54,600 millivolts (mV)
- Assuming 100% charged battery
- Total capacity is 54.6 volts (V) or 54,600 millivolts (mV)
- Example: Bafang 48V x 10.5 Ah Battery (used on the Sun E350 Trike)
- Current (mA)
Average current flow.- Positive = discharging (using power)
- Negative (if shown) = charging
🔋 Capacity & Charge
- Res Cap (Ah) (Remaining Capacity)
How much charge is left in amp-hours. - Full Cap (Ah) (Full Capacity)
Maximum capacity the battery can currently hold.- This decreases over time as the battery ages
- RelChargeState (%) (Relative State of Charge)
What most people think of as “battery %.”- Based on current usable capacity
- AbsChargeState (%) (Absolute State of Charge)
Charge relative to the original factory capacity.- Useful for understanding battery wear
- Useful for understanding battery wear
🔄 Battery Usage & History
- CycleTimes
Number of full charge cycles (0–100% equivalents).- 1 cycle = total of 100% used (not necessarily in one session)
- M.N.T (Max. No-charge Time)
Longest time the battery has gone without being charged. - L.N.T (Last No-charge Time)
Time since the battery was last charged.
🔋 Cell-Level Info (Very Important)
- Cell (Qty.)
Total number of cells in the battery pack. - Cell 1–13 (mV)
Voltage of each individual cell group. - Each cell as a capacity of 4.2 volts (V) or 4200 millivolts (mV)
- Assuming 100% charged healthy cells
👉 This is critical for diagnosing battery health:
- All cells should be very close in voltage
- Typical difference: ≤ 30–50 mV
- Larger differences = imbalance → possible issue
🧠 Quick Real-World Interpretation
- Healthy battery:
- Even cell voltages
- Full Cap close to original spec
- Normal temperature range
- Aging battery:
- Lower Full Cap
- AbsChargeState lower than RelChargeState
- Potential problem:
- One cell significantly lower than others
- High temperature
- Rapid drop in remaining capacity