Electronic gears, how do they work? As I happen to be endowed with the honor to use a Specialized S works road bike that was lying in a friend's basement, I decided to go for a ride until swift realization of the gears being  electronic and thus not powered.
There seems to be a place to perhaps plug a battery where a bottle holder is supposed to be, perhaps one is lying around where I got the bike from.
Now, I know nothing of such advanced bicycles and tend to see how certain advancements in terms of progress may seem immediately desirable but are not so convenient as I literally can't go for a ride without electricity.
I wished to know if any of you had any further insights on this matter that I could gratefully benefit from.
May you be well!
EDIT : Thank you everyone for your helpful guidance, an avid cyclist told me which battery was fitting and I found it, Dura-ace Di2 !
There are three major component manufacturers: Shimano, SRAM, and Campagnolo. Each has their own electronic shifting system.

SRAM's is simplest to recharge: the batteries are attached directly to the front and rear derailleurs; to recharge, detach one and put it in its dedicated charging base.
Shimano has a &quot;Di2 junction box&quot; either underneath the stem or in one of the handlebar endcaps, which can be recharged with a USB cable.
Campagnolo has a system called EPS that is similar to Shimano's.