Further, beware that some models have removed usb/logging support in later versions of their products.
The latter is somewhat limiting if you wish to use them for capacity testing. The cheaper chargers usually have limited power, around 50W charging and 5W discharging. It uses the temperature jack to connect to the PC (so you cannot measure battery temp simultaneously while PC logging). 'Tenergy PC Battery Monitor Software Kit' from all-battery on eBay), or which can be easily be assembled from a generic RS232 to USB board for a few dollars (most use the CP210x USB to UART Bridge VCP Drivers). That requires an optional RS232 to USB adapter which can be purchased in a kit for around $10 (e.g. The cheapest option is probably an Imax B6 clone ($20 or less shipped from US on eBay).
Download it and go to the menu 'Device/Choose device and port', where you will find a list of almost a couple hundred chargers supported, ranging from cheap Imax B6 clones to high-end iChargers. One very helpful way to obtain a list of chargers with PC datalogging capability is to consult the list of chargers supported by the free LogView software. 'Tenergy PC Battery Monitor Software Kit' from all-battery on eBay). The cheapest option is probably an Imax B6 clone ($20 or less. HUBSAN H501S charger, iMAX B6 Lipo Battery Balance. SkyRC IMAX PC Software Kit for IMAX Lipo Battery Chargers B6. Find great deals on eBay for imax software.
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