Trail cameras and battery life

Currently have four SPYPOINT Flex-M cameras I’ve had all four out since August 8th and they are pretty active roughly 150-300 photos per camera per day. My question is how long do you expect the battery’s to last? Both cameras finally just went below 100 percent. I’m using 8 energizer lithiums in each. I also get 4 updates a day. Is this just maybe the camera not reading the percentage right or is this pretty common with this brand? Coming from Browning cams without cellular and I used to get about three months of battery.