It's an OEM battery, but I often leave the key inside the car or leave doors open or the radio on. And I drive a lot of short trips. Constant state of charge is important to battery life. Takes all of 15 seconds to raise the good and clip the charger on. I don't see it as a hassle.

Link me to this Android if you don't mind? I feel like I've seen that before but did a search just now and didn't find what I thought was the same product, at least not for e70.