Frequently Asked Questions
How do I estimate battery life?
Hours = battery capacity (mAh) / device current draw (mA), times an efficiency factor of about 0.7 for real-world losses. So a 3,000 mAh battery powering a 300 mA load lasts ~7 hours.
What's the difference between mAh and Wh?
mAh × voltage = mWh. So a 3,000 mAh, 3.7 V Li-ion battery stores 11.1 Wh. Wh is a true energy unit; mAh is only meaningful at a specific voltage.
Why doesn't my phone's battery last as long as advertised?
Specs use ideal conditions (low brightness, light use). Real screen, GPS, cellular signal seeking, and high temperatures all increase current draw substantially.
How do I extend battery lifespan?
Avoid full discharges, avoid 100% charge for long periods, and keep cool. Lithium-ion batteries last longest cycling between 20-80% state of charge.
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Estimates for informational purposes only.
Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.