i just bought an epower from madvapes. i love having a standard, non-proprietary battery. this thing is awesome, long battery life between charges to. i no longer have the need to take extra batteries with me to work. anyways, i was wondering how long i can expect these batteries to last before they no longer hold a charge, being charged once a day? are they more reliable then a traditional e-cig battery that is a battery and switch in one package? next time i order juice im going to order 1 extra battery just so i have an extra on hand.