Welcome to Android Central! More battery stats would be helpful. 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 shows 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).
Do you routinely discharge the battery to single digits before recharging? If so, that could be a big part of the problem. Frequent deep discharges can shorten the battery's lifespan. In general, try not to let the battery get much below 40%.