How long will a 20,000 mAh power bank run a USB heated gilet?
About 7 h 24 min on a medium setting (7.5 W), from 6 h 25 min to 8 h 23 min depending on how efficient the bank is.
A heated gilet or vest warms the person rather than the room, which is the only kind of heating a small battery can manage. A 20,000 mAh bank holds about 74 Wh at its 3.7 V cells, of which about 75% typically reaches the USB port.
The numbers
| Setting | Worst case | Typical | Best case |
|---|---|---|---|
| Low (5 W) | 9 h 37 min | 11 h 6 min | 12 h 35 min |
| Medium (7.5 W) | 6 h 25 min | 7 h 24 min | 8 h 23 min |
| High (10 W) | 4 h 49 min | 5 h 33 min | 6 h 17 min |
A USB-A port supplies 5 V at up to 2 A, so 10 W is about the most a USB gilet can draw; most sit well below that on their middle setting. Wearing a coat over it keeps the heat in and lets you use a lower setting.
Other sizes
| Power bank | Energy | Typical |
|---|---|---|
| 10,000 mAh | 37 Wh | 3 h 42 min |
| 20,000 mAh | 74 Wh | 7 h 24 min |
| 26,800 mAh | 99 Wh | 9 h 55 min |
| 40,000 mAh | 148 Wh | 14 h 48 min |
Where to buy
USB heated gilet
A 20,000 mAh power bank
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When a power bank is not enough
A power station runs the same job from a mains socket, for far longer, and runs the things a power bank cannot: the fridge, the boiler's electrics, a mains electric blanket. For example, the Anker SOLIX C300 runs a heated jacket battery for about 10 h 31 min.
If this is for a power cut
For warmth without a power station, a power bank runs USB heated clothing for hours, and the no-power options cost pennies.
Hand warmers. Air-activated packs give hours of heat with no power at all, and a pocketful helps children and older relatives.
Look for: Long-duration packs, and the expiry date on bulk boxes.
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More: How to keep warm in a power cut, and the power cut essentials list (US edition).
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