Question

C-S2: Standard battery for the Blackberry Curve 8520
Type: Li-ion
Volts: 3.7 V
Weight: 23 g
Capacity:1150 mAh
Dimensions: 55 x 34 x 5.5 mm

Queston calculate:

1. the battery capacity in Wh
2. the volumetric energy density in Wh/cm3
3. the gravimetric energy density in Wh/kg.

Answer 1

C-S2: Standard battery for the Blackberry Curve 8520

Type: Li-ion

Volts: 3.7 V

Weight: 23 g

Capacity: 1150 mAh

Dimensions: 55 x 34 x 5.5 mm

Question calculate:

1. the battery capacity in Wh

2. the volumetric energy density in Wh/cm³

3. the gravimetric energy density in Wh/kg.

1. The battery capacity in Wh we can find from the battery capacity in mAh and its voltage:

$$P = U I = 3.7 V * 1150 * 10^{-3} A = 4.255 W h$$

2. The volumetric energy density we will find using the battery capacity in Wh and its volume:

$$W = \frac{P}{V} = \frac{P}{a * b * c} = \frac{4.255 W h}{5.5 c m * 3.4 c m * 5.5 c m} = 0.414 W h / c m^{3}$$

3. The gravimetric energy density we will find using the battery capacity in Wh and its volume:

$$W = \frac{P}{M} = \frac{4.255 W h}{0.023 k g} = 185 W h / k g$$