Involvement:Expert (understands the inner workings) - Ownership:more than 1 month
None, maybe a bit cheap but don't work
They don't perform near as good as true Walkera batteries. they inflate and then they loose power.
They are also dificult to fit in the chopper cage.
You will be lucky if you get more than 2 minutes fly
They should not be sold under the Walkera name as they are not a true brand item. In most countries its illegal to sell items that are copies.
I think Deal Extreme is not acting correctly but advertising them as Walkera
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