How to prepare the Avitron Mech-Bird for flight

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Which batteries should I use for the controller? Video tutorial (batteries / charge / startup)
Six AA size (LR6) batteries. It should be noted that even rechargeable batteries of same size can be used, if they are of high capacity ( 2000 mAh or above). It is recommended to use at start a pack of new / identical batteries. The wear of each battery will occur at exact same speed, and you will need to replace them whole at same time. If you mix new and old batteries, old ones will be quickly worn, and your device won't work anymore, although several batteries are still OK.

Is the product guaranteed?
This product is warranted against defects in material and workmanship under normal use (as described in the manual supplied) for thirty (30) days from the date of purchase (Keep your purchase receipt).