Battery Life Calculator
Estimate battery runtime from capacity, load current, and discharge efficiency.
Input parameters
Calculation results
Please enter the parameters and click the Calculate button.
Runtime
0 hour
Number of days
0Sky
minutes
0 minutes
Calculation formula
t = (Q x n) / I
t = run time (hours), Q = battery capacity, n = discharge efficiency, I = load current
Important Note: The actual battery capacity is related to temperature and aging.
- -Temperature Effect: Battery capacity varies with ambient temperature. Below 0 °C, lithium-ion capacity may fall by 20–30%; temperatures above 40 °C accelerate aging.
- -Aging degradation:Battery capacity gradually degrades during repeated charge and discharge cycles; lithium-ion batteries typically retain 80% capacity after 300 to 500 cycles.
- -Discharge depth: Deep discharge (DOD > 80%) can shorten battery life. Where possible, keep discharge depth within 50–80%.
- -Storage conditions:For long-term storage, maintain a battery charge between 40% and 60%, and avoid storing at high temperatures or in a fully charged state.
Common Battery Capacity Reference Table
| Battery Type | Common Capacity Range | Rated voltage | Discharge efficiency | Cycle life |
|---|---|---|---|---|
| Lithium-ion batteries | 500mAh - 5000mAh | 3.6V / 3.7V | 85-95% | 300-500 times |
| Lithium polymer battery (Li-Po) | 100mAh - 10000mAh | 3.7V | 85-95% | 300-500 times |
| Lithium Iron Phosphate Battery (LiFePO4) | 1000mAh - 10000mAh | 3.2V / 3.3V | 90-98% | 1,000–2,000 times |
| Lead-acid battery | 1Ah - 200Ah | 2V / 6V / 12V | 70-85% | 200-500 times |
| Nickel-metal hydride battery (NiMH) | 500mAh - 3000mAh | 1.2V | 80-90% | 500-1000 times |
| Nickel-cadmium battery (NiCd) | 500mAh - 2000mAh | 1.2V | 70-85% | 500-1000 times |
Usage Precautions
- Avoid overcharging and over-discharging.
- Use the matching charger.
- Do not use or charge under extreme temperatures.
- Charge periodically when not in use for an extended period to maintain battery level.
- Damaged or swollen batteries should be replaced promptly.
- Dispose of spent batteries according to local regulations.