The good news is you can order replacement solder tabs

Also, the load on servos remains pretty similar regardless of operating voltage because the demands to turn the wheels remain consistent. The current draw when running a higher bec voltage (say 6-6.5v) will likely be lower than when running a lower bec voltage (5.0v). Low voltage forces more of the servo watts to come from current draw, high voltage allows more of the servo watts to come from the additional voltage. Remember P=IV