Default OEM replacement battery?

Hi, does anyone know of a replacement battery that is compatible with the TS?

Be cool if we could get some lithium-ceramic or lithium-air batteries made up

Btw one of these flexible strap batteries are cool, maybe we could get some?

http://gizmodo.com/flexible-battery-...unt-1585884723
LG G2 32GB KitKat
Omate TrueSmart Watch 8GB EU JellyBean