Dentro de casa cargador significa CHARGER o BATTERY CHARGER. Ejemplo: Cargador del móvil (mobile's charger), cargador del ordenador (pc's charger).
Damián lo ha dicho perfecto
This section is for you to write in order to be corrected. If you want to make questions, there is a better section. But anyway, my answer is as follows:
cargador frontal =front-end loader
cargador de batería = battery charger
cargador de pilas = battery charger · battery recharger