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SOTAbeams USB Battery Pack Keep-Alive Load Kits
SOTAbeams USB Battery Pack Keep-Alive Load Kits are easily assembled PC Board kits that provide an adjustable USB DC load. Some power banks and many USB battery packs switch off (go into a sleep mode) if the current being drawn is too low. This means that your device works for a few minutes and then stops. Often just a few extra milliamps current draw will keep the battery pack alive. There are various circuits on the web that give a pulsed load which works with some battery packs - but unfortunately SOTAbeams' tests have shown that such circuits don't work reliably with all battery packs. Just plug one of these Keep-Alive Load Kits into your battery pack and increase the current until battery pack stays on reliably (usually between 6 - 150 mA). Depending on the current that your powered device takes it may be a little as a few milliamps. An on-board LED indicates if the battery pack is live. The load supports a standard USB data connection. USB plug and socket for easy in-line connection. A heat-shrink sleeve is provided to protect the unit in the field. Don't have your WSPRlite lose its power source! Keep it powered up with SOTAbeams USB Battery Pack Keep-Alive Load Kits from DX Engineering.
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$15.99