I have a problem with the rs10 buy two units and installed on the two batteries 3800mha but both are very short duration of use should not be if the two motors 380 that are inefficient and consume a lot and maybe the fan is speed control that you recommend? The charge lasts about 15 minutes whilst a rock crawler Axial 540 single engine with the same battery lasts 55 minutes

thanks

Fabian Vindas
Heredia Costa Rica