# CR2 or 2x LIR2450 has more energy?

I wonder if the CR2 gives much more usable energy than 2x LIR2450. If my numbers are right, the CR2, typical capacity is 800mA (to 2V), so the amount of energy is around 2J (2.5 * .8). On the other hand, the LIR2450, has a capacity of 100mAh (to 3V), so the amount of energy is around 0.37J (3.7 * .1) each - or 0.74J for two.

However, the volumes of the two are roughly the same: 2x LIR2450 is 4524mm^2 whilst CR2 is 4595mm^2.

Is my analysis correct?

• No, you have omitted the all-important "h" in a couple of places i.e. 800 mA should read 800 mAh. You have also used the average voltage of the battery to calculate things. In fact, for accuracy you need to determine energy levels as the voltage drops. There may be other errors. – Andy aka Jun 16 '17 at 12:34
• and the chemistry is slightly different for LIR vs CR. – ammar.cma Jun 16 '17 at 12:36