1 amp charger will work, you may want to buy an actual charger designed for 18650's and keep charged spares with you in a plastic container. Takes time to charge 18650's via USB or regular charger, but atleast you can bring as many batteries along as you want.im going to be buying a portable battery charger for my phone tomorrow. Is there a certain one/type I should get to also charge my mod? Going to be charging different duel 18650 battery mods. Thanks