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EEVblog #772 - How To Calculate Wasted Battery Capacity

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Published on Jul 27, 2015

In this tutorial Dave explains how to precisely measure and calculate the remaining (or wasted) energy capacity in a battery using the graphical analysis technique using a spreadsheet.
The differences between constant power and constant current loads and when to use them is discussed.
Also, the importance of ESR and measuring the battery voltage under load is demonstrated.
This is a particularly relevant to the Batteriser product and proof is provided that shows that even over the entire current range, the wasted energy in a battery can be no better than a few 10's of percent for a 1.1V cutout voltage. Blowing the batteriser claim of 80% wasted energy out of the water.
Forum: http://www.eevblog.com/forum/blog/eev...

All of my battery related videos are here: https://www.youtube.com/playlist?list...

DIY Constant current load: https://www.youtube.com/watch?v=8xX2S...
Battery Capacity Tutorial: https://www.youtube.com/watch?v=R8hTQ...
AA Battery Capacity Measurement: https://www.youtube.com/watch?v=uT4hK...
Batteriser Debunking Video: https://www.youtube.com/watch?v=4iEsh...
LiPo Battery Discharging: https://www.youtube.com/watch?v=ln8Ml...


EEVblog Main Web Site: http://www.eevblog.com
The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2

Support the EEVblog through Patreon!
http://www.patreon.com/eevblog

EEVblog Amazon Store (Dave gets a cut):
http://astore.amazon.com/eevblogstore-20

T-Shirts: http://teespring.com/stores/eevblog

Donations:
http://www.eevblog.com/donations/
Projects:
http://www.eevblog.com/projects/
Electronics Info Wiki:
http://www.eevblog.com/wiki/

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