Battery Watt-Hour (Wh) Calculator
Convert phone battery capacity (mAh) and voltage into watt-hours, then check where it sits against UN38.3 lithium air-freight limits. A free tool for importers, forwarders and repair supply chains.
3,000 mAh x 3.85 V = 11.55 Wh (3.00 Ah)
Formula: Wh = mAh / 1000 x V x cells. UN38.3 / IATA thresholds (20 Wh per cell, 100 Wh per battery) are provided as general guidance only - confirm current dangerous-goods rules with your carrier or freight forwarder.
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Watt-Hour Calculator FAQ
How do you calculate watt-hours from mAh?
Watt-hours (Wh) = milliamp-hours (mAh) / 1000 x nominal voltage (V). For example, a 3,000 mAh phone battery at 3.85 V is 3,000 / 1000 x 3.85 = 11.55 Wh.
What voltage should I use for a phone battery?
Most modern lithium-ion phone batteries have a nominal voltage of about 3.8 to 3.85 V; older cells use 3.7 V. Use the exact nominal voltage printed on the cell or its datasheet for an accurate watt-hour value.
What are the UN38.3 watt-hour limits for air shipping?
For lithium-ion, cells up to 20 Wh and batteries up to 100 Wh fall under the less-restrictive limits, while anything above 100 Wh is treated as fully regulated Class 9 dangerous goods. Nearly all single phone batteries are under 20 Wh, but always confirm the current IATA rules with your forwarder.
Does Doolike provide watt-hour and UN38.3 data for orders?
Yes. Doolike provides the rated capacity, nominal voltage, calculated watt-hours, UN38.3 report and MSDS for battery orders so your freight forwarder can classify and ship the shipment correctly.