Walkera 3.7V 400mAh Rechargeable Lithium Battery for 5-6 / 5G6 / 4#3 Helicopters

Pros: These have a true 400mAh capacity. I tested them with a pro-level charger/discharger, discharged to 3.0v at 2.5C (1.0A). They work well with my Walkera Lama 2 and give the same flight time as the original OEM battery that came with it, about 8-9 minutes.

Cons: They don't appear to be real Walkera batteries, whereas the 500s and 600s that are also available here do.
They fit slightly looser in the battery holder, so after a minor crash, you have to make sure it is all the way forward again for the weight balance, but this is a minor complaint.
Even as a set of 3, they are more expensive than the 500s or 600s.

Other: Recommended replacement, true capacity battery that work well for intended purpose. Not exactly cheap, but certainly reasonable price, especially with included shipping, which is fast.

Pros: It seems to be a good construction battery for small size RC helicopters. I didn't charge it yet, but I'll do this as soon as I receive my walkera mini CP.

Cons: I bought as an original Walkera 3.7V 400mAh battery, but I received a generic 3.7V 450mAh. The battery doesn't have the manufacturer identification, so It's difficult to get more detailed information.

Other: I don't know the durability comparing with the originals.