Since we've got so many uses for the tiny power sipping variety of Arduinos, we need solid power sources for them all so we also buy these in sets of 5. The output voltage of these works perfectly well with these Mini Arduinos without the need for another, power wasting, power regulator.
This one comes with a charger which is nice, especially if these are your first batteries of this style.
OBBEY X5 Intelligent Charger for 3.7V Lithium RC Batteries
Light and handy and very easy to operate
Input: DC 5V, 0.5~2.5A
Output: DC 4.2V 2.0A
Battery Type: Lithium
Size: 51 x 30 x 10mm
Red Lights on: currently charging
Red Lights off: charging complete
Battery Weight: 0.90 oz
Battery Size: 2 x 1.18x 0.39 inch
5x 3.7V 1000mAh lipo battery
1x X5 Charger
1) The input voltage :5V
The input voltage :2A
2)DonÃ¢â‚¬â„¢t connect the charger to an adapter of more than 5V to charge batteries.Otherwise,the charger will be damaged or even burnt
3)When you receive the item,inspect the battery for any damages or swelling .DonÃ¢â‚¬â„¢t charge a damaged battery or a swelled battery .If you have any issue ,please feel free to contact me.
4) DonÃ¢â‚¬â„¢t overcharge the batteries.I suggest that you should use the charger with the overcharging protection function.
5)Make sure that the batteries are charged in the safety place.You had better put them into lipo safe bag while charging