I haven't had them for very long or driven them very hard, so I can't speak to their durability, but each battery appears to charge and read accurately. The run time appears to be more than adequate. These do not fit in my battery compartment but I knew that in advance before purchasing. The velcro straps help keep the battery on the motor and chassis of our RC trucks. The balance board plug is larger and easier to grasp and unhook, which I like. So far, it appears to be an excellent value for money.
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