Update README.md

README.md

@@ -33,10 +33,10 @@ P = IV = 5 * 10^{-3} * 3.3 * 0.05 = 0.825 mW
 0.825~mW~for~365~days = 7.2 Wh
 ```
 ```math
-E [Wh] = (Q [mAh] * V [V])/1000
+E [Wh] = \frac{Q [mAh] * V [V]}{1000}
 ```
 ```math
-Q = (1000 * 7.2)/3.3 = 2181 mAh
+Q = \frac{1000 * 7.2}{3.3} = 2181 mAh
 ```
 
 The CR2477 is one of the largest coin cell batterys (20mm diameter and 4.7mm thickness) and has a capacity of ~1000 mAh.