I tried to upgrade my teen's ancient kyocera (so old you have to extend the external antenna!) to the Marbl. My teen rarely uses his phone, but it gets the job done and "never" needs charging. I charged the new Marbl and left it unused and closed overnight and in the morning the battery was low and the phone could not be used. I thought about exchanging the phone until I saw all the CNET reviews complaining about lousy battery life. I returned the Marbl and will wait till something better comes along.