Welcome to Android Central! Are you saying that the battery is draining faster? Keep in mind that for the first day or so after doing a major upgrade, the battery might drain a little faster due to the update activity itself, and possibly also a number of apps updating.
Charge up to 100%, then let it drain to 20-30% with normal usage, without charging in between. Then show us:
1. The main Settings>Battery screen.
2. The fullscreen battery graph screen (which may show Awake time and Cell Signal Strength).
3. The Screen category (to see total Screen On time).
4. The Cell Standby category, if present (to see Time Without Signal).