3.7 Volt 1300 - 1400Mah Lithium Ion Rechargeable.
Lightweight, only about 39 grams per cell. Very good
power / weight ratio. Dimension 1 cell 18mmx65mm.
Dimension 8 cell pack 130x110x19mm
Panasonic Lithium Ion CGR18650 Matsushita Electric
(Pink)
15 in a pack from Black laptop.
Spec from pdf: 3.7V, 1400 mAh 18.3 +- 0.5mm Diam 63.2
+-0.5 mm heigh 38 gram