NeonHorizon/lipopi

How long does the battery last?

oskarpearson opened this issue · 1 comments

oskarpearson commented

Hi

Thanks for this - looks useful!

Would you be able to update this with details of how long the battery lasts with different capacity batteries, based on your experience with it?

Oskar

NeonHorizon commented

Hi Oskar,
You can calculate this using the watt hours.

For example if you have a 2000mAh battery and we presume that its 3.7v on average this gives you 3.7v x 2000mAh which is 7400mWh

If we now look at the power consumption of a Raspberry Pi we can work out how many Watts it uses. I use Alex's RasPi.TV site as a reference:
http://raspi.tv/2016/raspberry-pi-zero-1-3-power-usage-with-camera

So if we pick a PiZero shooting video thats 240mA @ 5v, which is 5v x 240mA = 1200mW

So we now know our battery has 7400mWh of capacity and the Pi uses 1200mW. So 7400mWh / 1200mW = 6.16 hours.

Therefore a PiZero recording video will last 6 hours on a 2000mAh battery :)

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