Sony Np-Bx1/M8 Battery Rechargeable Lithium-Ion Battery

NP-BX1/M8 X-series battery retains 1240 mAh capacity and weighs 1.09 oz. 

Features

Lithium ion Type X rechargeable battery

Approx. capacity: 3.6 V / 4.5 Wh (1240 mAh)

Approx. dimensions (in): H0.26 x W1.18 x D1.68

Approx. weight: 0.88 oz