Based on some beta-tests last year, I switched all my setups to external 12V 10Ah lithium batteries, placed in Remington ammunition boxes. These batteries can be found on Amazon for as little as $35. With the boxes ~$12 and power cords ~$8, you end up with a rig that you never have to purchase batteries for, which runs for months and can be recharged more times than you will ever need. Plus it's lithium, so you get that sweet profile at colder temperatures and full power up until they're discharged - making for better night pics. Win, win IMHO. Buy once, cry once. You can save some $ by going lead acid, but the weigh gets to be cumbersome if you have to go far to hang them, and they're not as good in the cold.
FYI, Tactacam takes a different plug diameter than most (5.5 x 2.1 on Browning, Moultrie, Spypoint, etc; whereas Reveals are 4.0 x 1.7), also lithium batteries use a different charger.