I think it depends on the FC Version / the used Caps. IIRC by default it's around 16V, which is sufficient for 4S.. if you want more you have to exchange some parts.
This item is returnable to seller . Buyer to pay all shipping charges. This includes all shipping charges for any reason. Seller reserves the rights to cancel your order for any reason and refund you 100% of your purchase including the shipping you paid without penalty. Contact Seller if you have any problem with your product. rctophobby store
