For anyone who hasn’t tried these rechargeable batteries they are a must. I use them as my primary battery in all my 200c and 250c Tx with zero issues. On my last project I saved over $1000.00 over using standard Ultralife 9v Lithium’s. The starter kit from Trew Audio includes a 4 bay charger and 4 batteries for $94.00.
The charger charges each battery in about an hour and also has a car adapter. I get the same or better battery life as with normal batteries. The only thing that needs to be watched is that they die suddenly so watch the voltage level on the Rx is important. Here is where to buy them http://trewaudio.com/store/product.php?productid=780&cat=2&page=1
So try out a set they will pay for themselves