# The real supplied energy for some device is not equal to the energy of a battery, right?

These are some informations about the Lithium-ion button battery LIR2032:

1. Voltage: 3.6 V.

2. Capacity 35 mAh.

So its full energy is $$\3.6 \times 35m \times 3600\ \text s=453.6 \ \text J\$$

But if this battery is used in a device,which minimum working voltage is 3 V, I mean when the voltage of battery is less than 3 V, the device won't work.

So the real supplied energy for this device is $$\(3.6-3) \times 35m \times 3600 \ \text s=75.6 \ \text J\$$, not $$\453.6 \ \text J \$$, right?

• so this figure show me this battery can only supply some device to about 3.2V(100%)?so the whole energy of this battery to other device is $(3.6-3.2) \times 35m \times 3600s=50.4$ ? Aug 30, 2019 at 3:31