On the website, the developers said that you have to charge its internal button battery about once every month. You also have to charge it for 8 hours when you first get the card. From what i know, most rechargeable batteries like the ones in cell phones and DS systems will shorten it's life span if you recharge it while it's still half full. Would the internal button battery in the EFA Linker shorten its life if you recharge it while it's still not empty on juice? Cause there's no way to tell the charge level of the battery.