A useful gadget for charging, in my case, Canon camcorder batteries that the the inbuilt Canon charger will not handle. The product is also flexible enough to charge my other camera batteries. Works off mains supply or off car accessories socket - which is useful when on the move. Needs a bit of care when aligning battery terminals to connect with charger terminals - but once in place it works fine.
Happy with this product. Really good.
No problems with operation, and as it's a universal charger, it's good value, since it an be used with batteries other than the one it was bought with.