I have had the same Mojo for about 5 years now. And even though I do not use it much because I dio not duck hunt a lot. I have never had aproblem with my battery statying charged. I have had it fully charged and it last 3-4 day worth of duck hunting and it was still going. I know that you can buy some replaccement batteries for them and they are not all that to expensive. I would say go for it...here in Colorado you need at least one, becasuse everyone else is using atleast one.
When hunting whitetails there are many different languages being spoken afield that I key on when outdoors. All these little creatures living around whitetails have something to tell us if we are willing to listen.
My favorite tattletales of the outdoors are a handful of little birds that live in my state of Ohio. Maybe yours too. A tip for the upcoming season.
There are Blue Jays, Cardinals, Chickadees, Killdeer, and Sparrows that all have language...