100% Free — No Sign-upFree Battery Tools
Free Battery Tools
& Calculators
Diagnose battery issues, calculate charging times, and size your solar system — all for free, no account required.
Calculators
Crunch the numbers on charging, runtime, and battery life
Charging Time Calculator
Calculate how long it takes to charge your device from any percentage to full.
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Solar Battery Sizer
Find the right battery bank size for your solar system based on daily usage.
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Laptop Runtime Estimator
Estimate how many hours your laptop will last on a full charge.
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Battery Cycle Life Calculator
Check how many charge cycles your battery has left and when to replace it.
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Diagnostic Tools
Interactive flows to diagnose battery & charging problems
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