damaro

Hi all. I have a 2012 E550 cabriolet that I will be storing for an extended period. I plan to put the primary battery on a trckle charger and have an individual who will start it and drive it peridically but someone asked if I would be using a second battery tender on the accessory battery in the trunk. I've never heard of the need to trickle charge this battery. Thoughts on whether or not this is necessary?