Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
High capacity and look fine (let's test quality over time). Perfect to provide 3,3v power to devices such as some Arduinos or panstamps.
Nothing, they are really cheap according to their capacity (you will not find everywhere 3000mAh batteries and for sure with this price)
Use it together with the battery holder for your DIY projects available at: http://dx.com/p/3-7v-1-x-18650-battery-holder-case-box-with-leads-100999 and the battery charger available at: http://dx.com/p/digital-li-ion-18650-battery-charger-6105
All three items together are really cheap: 16€ for the pair of batteries, the charger and the holder (It should be nice to have a pack for this). Need to test durability over time.
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