calling on lost dogs

In the actual GPS, I use 2 Lithium Energizers. They lasted me about 3 weeks of normal hunting before it showed one bar of battery life being gone. I normally hunt about 4 times a week. Alkalines work too they just dont last as long. The collars are rechargeable in the truck or house. They last any where from I think 17 hours up to 36 hours on a charge depending on what setting you have them on. I havent had one die on me yet. I did have one of the collars lose GPS signal for the first time in Oklahoma this week. I had it upside down under they dogs neck and was watching the dog from about 10 yds away. it was fighting a hog in a stock tank and when the collar went under water it lost signal. It still shows you where the collar was when it lost signal so it is no big deal. It got signal back after about 5 seconds.