I fitted a 2,000 mAh battery into my Sena SRL2. The longer pack wouldn't fit in the original case, so this became more than a battery swap: I trimmed the housing and mounting plastic, made a new covering, and removed some foam inside the helmet to get it all back in.
The whole point of this idea is more range between fuel stops. I'd like a removable upper tank for my Tracer 900 GT, sitting where a tank bag normally goes. An adapter replaces the stock cap, a fire-hose-style quick coupling connects the upper tank, and that tank has its own filler cap.
I wanted to turn a Samsung Galaxy XCover Pro into a dedicated wireless Android Auto display. I used a modified version of Open Headunit, without rooting it, adding a USB dongle, or installing a companion app on the phone sending Android Auto.