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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:    • Batteries & Charging   DIY Constant current load:    • EEVblog #102 - DIY Constant Current Dummy ...   Battery Capacity Tutorial:    • EEVblog #140 - Battery Capacity Tutorial   AA Battery Capacity Measurement:    • EEVblog #141 - AA Alkaline Battery Capacit...   Batteriser Debunking Video:    • EEVblog #751 - How To Debunk A Product (Th...   LiPo Battery Discharging:    • EEVblog #393 - LiPo Battery Discharge Testing   EEVblog Main Web Site: http://www.eevblog.com The 2nd EEVblog Channel:    / eevblog2   Support the EEVblog through Patreon!   / 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/