My TH batteries are going on two years old now and I was thinking about replacing two of them for this springs flying. I have four batteries all purchased when I got my H in June 2016. One of them only lasts about 10min when flying in the cold. ( I know the cold shortens the fly time). My question is where is the best place to get new batteries? I usually get my gear from B&H and am going to the city next month and was going to get a couple then. I wonder how long some batteries have been sitting on the shelf and how good they will be ? I looked and did not see any date codes on the Batteries or the boxes they where shipped in for references. If new batteries are sent from the factory at about 15 volts, will they still hold that charge if they have been sitting for two years? Batteries run between $99 and $139 from various vendors, with B&H being the cheapest. THANKS !