Sea To Summit X Mug Rechargeable Built-in rechargeable Li-ion battery provides

Built-in rechargeable Li-ion battery provides a maximum runtime up to 22 hours

Dimensions: 11" x 3

Volume:3051 cu-in (50 L)

MicroSD Card (2GB)

You can buy the Nitecore NL1834 (NL189) 3400mAh protected 18650 rechargeable battery here at Going Gear

Sea To Summit X Mug Rechargeable Built-in rechargeable Li-ion battery providesThe X trio is complete! The X Mug is constructed from a flexible, European standard compliant, food grade silicone. A rigid ring within the rim keeps it sturdy to hold onto and easy to drink out of but still allows the mug to be collapsed to a disk that will fit in the palm of your hand! The X Mug fits neatly into the X Bowl and X Plate and altogether the collapsed set is less than an inch thick. Folds flat for compact packing Food grade flexible