I have been given the following statistics for a battery and I have been asked to find the 1) battery capacity in Wh 2) volumetric energy density in Wh/cm3 3) gravimetric energy density in Wh/kg.
Volts: 3.7 V
Weight: 23 g
Dimensions: 55 x 34 x 5.5 mm
Could someone please check I am doing this right before i commit it to memory.
1) watt-hours = milliampere-hours * volts /1000
Watt-hours = 1150 mAh * 3.7 V / 1000
Answer = 4.255 Wh
2) To find the volumetric density in Wh/cm^3 so we use the formula Wh/cm^3
4.255Wh/10.29 cm ^3
Answer = 0.41cm ^ 3
To find the gravimetric energy density in Wh/Kg, we divide Wh by the weight of the battery in Kg (23g = 0.023Kg), so we have
4.255Wh / 0.023Kg = 185 Wh/Kg