In my opinion, Bosch has one of the most under rated 12V lines around.  It’s weird because they are one of my favorite 12V lines along with Milwaukee.  I love there 12v drill and impact and is probably one of my most used 12V tools.  Anyways, I am happy to let you know that Bosch has just improved their 12V line with an introduction of a 2.5 Ah batter, model BAT415.  The 2.5 Ah will give the user roughly 25% more runtime than their previous 2 Ah batteries.  The batteries will work down to -4 degree Fahrenheit.  If you are a Bosch fan and use their 12V tools, this would make a nice addition.  It seems to be the same size as the 2 Ah batteries and they will work with all your 12V Bosch tools.