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通过micro USB充电，容量1250mAh。
The Third Rail Universal Smart Battery is an amazing power solution for charging your mobile devices.* You can use it as a standalone back-up battery to charge hundreds of different devices through micro USB. It can also slide onto any Third Rail case and be used as on the go power when your battery gets low. The Smart Battery has a low profile and is super light at 39 grams, making it compact and great for taking on the go. Innovative Third Rail technology even allows Smart Batteries to be stacked, so you can use up to 6 partially charged batteries, stack them and the power will be consolidated and ready for your mobile phone, MP3 playeror other mobile device. The stacking function also allows you to charge multiple Smart Batteries through one power outlet.
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