Here is what I've learned about batteries in the past.
Lithium - normally increments of 3V, most expensive, best performing battery in cold weather, handles large current draw, provides constant voltage for life of battery (no way to predict remaining life by voltage), well-suited to fast draw electronics that require constant voltage
Alkaline - starts at 1.5V plus or in increments of and slowly loses voltage over the life of the battery, accurate indication of remaining battery life by voltage measurement, holds charge well over time but is not the best suited for large current draw, economical
NiMH - voltage in increments of 1.2 (for this reason battery status will read low vs. alkaline), maintains voltage during life of charge (not good indication of remaining life), handles large current draw, low memory and can be recharged many times (best attribute because batteries can be changed at every opportunity), will lose significant fraction of charge over time even without drain, not sure about performance at low temperatures, expensive up front
I hate wondering how much longer alkaline batteries will last. Therefore, I would normally go rechargeable and change them out at each opportunity. However, if battery life is long (i.e. Cuddeback advertised at 6 mo.) then alkaline makes sense.
Has anyone had any luck with NiMH in trail cams?
Does anyone have any experience with the little 6V sealed lead acid batteries by Moultrie? I've had one on the charger for 3 days and still not getting a full 6V. Either the battery or charger is bad.