You'll have to make your mind up whether you'd like a manual charger or an automatic charger, in addition to just how much power you would like (far more powerful chargers replenish batteries faster). Ultimately, you'll need to find out how much you should invest within the battery charger. It's https://hukums.com/products/painter-spray-plastic-air-blow-gun-with-air-controller-abg-05p