![]() We ended up using the following Voltage configurations for current versions of our batteries: Battery ![]() But, depending on the configuration of the two data pins AND the current draw of your device, a USB output may charge all, some or no devices. In all cases, pin 1 is 5V (with a little wiggle room, spec allows from 4.75 to 5.25 V, and we aim for the upper end of that range to compensate for voltage drop due to high current draw) and pin 4 is 0V. The USB receptacle or female connector has 4 pins: Hopefully, this will be useful if you’re trying to make your own USB charger. We make these battery packs available standalone and as part of our solar chargers for iPhones. This post tells you the Voltage that we use on each pin in current versions of our USB battery packs. We pay particular attention to Apple products and now, with the introduction of the iPad, it has become slightly more complicated to have a one size fits all solution. We continually make minor tweaks to the USB output of our batteries to make sure we charge as many devices as possible.
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