Battery Life Calculator
Estimate runtime & battery lifespan
Battery Type
Battery Specifications
Device Power Consumption
Battery Status
Battery Information
Battery Discharge Curve
Energy Distribution
Battery Type Comparison
| Battery Type | Energy Density | Cycle Life | Self-Discharge | Best For |
|---|---|---|---|---|
| Li-ion Best Overall | 150-200 Wh/kg | 500-1000 cycles | 1-2%/month | Electronics, EVs |
| LiPo | 100-265 Wh/kg | 300-500 cycles | 1-2%/month | RC, Drones |
| NiMH | 60-120 Wh/kg | 500-1000 cycles | 15-20%/month | Rechargeable AA |
| Lead-Acid | 30-50 Wh/kg | 200-300 cycles | 3-5%/month | UPS, Cars |
| NiCd | 40-60 Wh/kg | 1000-2000 cycles | 10%/month | Power tools |
Energy Density Comparison
Cycle Life Comparison
Battery Care Guide
Charging Best Practices
- Avoid charging to 100% regularly for Li-ion batteries
- Keep battery between 20-80% for optimal lifespan
- Use original charger or certified alternatives
- Avoid fast charging when not necessary
Temperature Management
- Optimal operating temperature: 20-25°C (68-77°F)
- Avoid extreme heat (>45°C) and cold (<0°C)
- Don't charge in extreme temperatures
- Store batteries at 40-50% charge in cool, dry place
Storage Guidelines
- Store at 40-50% charge for long-term storage
- Check stored batteries every 3-6 months
- Keep in cool, dry environment (15-25°C)
- Remove from device if storing for extended periods
Warning Signs
- Swelling or bulging battery - STOP USING IMMEDIATELY
- Excessive heat during charging or use
- Rapid discharge or inability to hold charge
- Physical damage or leakage
Battery Life Extension Tips
Avoid Heat
Heat is the #1 enemy of batteries. Keep devices cool and avoid direct sunlight
Smart Charging
Use optimized charging features and avoid overnight charging when possible
Partial Discharges
Reduce Power Draw
Lower screen brightness, close unused apps, and disable unnecessary features
Understanding Battery Life
Battery life depends on multiple factors including battery capacity, device power consumption, efficiency, and usage patterns. Understanding these factors helps you estimate how long your battery will last and how to maximize its lifespan.
Battery Life Formula
The basic formula for calculating battery runtime:
- Runtime (hours) = Battery Capacity (mAh) ÷ Current Draw (mA)
- With Efficiency: Runtime = (Capacity × Efficiency) ÷ Current Draw
- Energy (Wh) = Capacity (Ah) × Voltage (V)
- Power (W) = Current (A) × Voltage (V)
Battery Types Explained
Different battery chemistries have different characteristics:
- Li-ion: High energy density, long cycle life, low self-discharge - best for electronics
- LiPo: Lightweight, flexible shape, high discharge rate - ideal for RC and drones
- NiMH: Good cycle life, environmentally friendly - common for rechargeable AA/AAA
- Lead-Acid: Low cost, high current capability - used in cars and UPS systems
- NiCd: Very long cycle life, tolerant of abuse - used in power tools
Factors Affecting Battery Life
Several factors influence actual battery runtime:
- Temperature: Extreme temperatures reduce capacity and lifespan
- Age: Batteries lose capacity over time (typically 20% after 500 cycles)
- Discharge Rate: High discharge rates reduce usable capacity
- Depth of Discharge: Shallow discharges extend cycle life
- Charging Habits: Proper charging extends battery lifespan
Using This Calculator
Follow these steps:
- Step 1: Select your battery type (Li-ion, NiMH, LiPo, or Lead-Acid)
- Step 2: Enter battery capacity in mAh, Wh, or Ah
- Step 3: Enter nominal voltage (e.g., 3.7V for Li-ion)
- Step 4: Enter device current draw in mA, A, or Watts
- Step 5: Enter system efficiency (typically 85-95%)
- Step 6: Click "Calculate" to see estimated runtime
- Step 7: View detailed battery information and charts
Explore More Calculators
Discover more useful calculators in our calculator collection, including tools for electronics, physics, and more!