For the size, these motors are really powerful. The props attach to them with a gentle push and are held in place only by small groove on the motor shaft. This is a great security feature as in most cases the prop just pops off the shaft when you drive the copter to a wall etc. You then just push the prop back on and keep on flying.
You get two of these 250 mAh batteries. They are 1S lithium polymer batteries and if needed, you can find replacements easily from the internet. One of the batteries give a flight time around 6-9 minutes depending on what kind of acrobatics you do. I personally feel that this is plenty of flight time for this kind of toy but hey, you can always buy more of these.
The charger is very handy as it allows you to charge both of the batteries at the same time. The led indicators on top of the unit clearly indicate when each of the batteries is fully charged. Naturally you can charge one battery at the time if needed and plug and unplug them as you please.
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