Understanding Battery ReadoutsUpdated a month 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
- Total Volt (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
- If a single cell reaches at least 4150 mV, it is considered fully charged
👉 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