A normal AA battery is probably more powerful than this tiny thing. That cell is probably 3.7v 250 mah at best. My “shitty” ikea rechargeable AAs are like 900 mah, and the good ones are 2400 at 1.2V. 3.7 * 250 is 925 watt hours, 1.2* 900 is 1000, and 1.2 * 2400 is 2800.
The biggest benefit is these are easily and quickly rechargeable.