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Table of Contents
Quansheng UV-K5 13.8 V DC Charger Conversion
Rationale
The standard mains charger supplied with the Quansheng UV-K5 has been reported to generate significant radio-frequency interference (RFI). Although the transceiver supports USB-C charging, this method is comparatively slow and does not charge the battery beyond approximately 80 % of its nominal capacity.
Converting the charger base to operate from a regulated 13.8 V DC supply mitigates these issues and allows the charger to be powered directly from a typical amateur radio station power supply.
Method
The conversion utilises a low-cost TP5100 lithium battery charging module and a replacement bi-colour red/green LED with a common-anode configuration. The original indicator LED supplied with the charger is common-cathode and therefore incompatible with the TP5100 module.
The TP5100 module is configured for 8.4 V (2-cell, 2S) charging by shorting the pads marked “SET” on the module. Construction is straightforward and should be clear from the image below. The module was secured inside the charger base using hot-melt glue.
Parts Sourcing
All required components are widely available from common online suppliers. The bi-colour LED was obtained from this eBay listing, and the TP5100 charging module from AliExpress.
Acknowledgements
The author wishes to acknowledge the assistance and advice provided by members of the Quansheng UV Radio UK Users Facebook group.
73, GM5DNA