Any body have trouble using the 3.6v battery in their dual optic? My dual optic had a 3.4v battery in it. My Radio Shack only carries the 3.6v one and not a 3.4v. I emailed HK (no help there for where to find the proper one) and it took a couple emails for them to tell me I could not use the 3.6v one that it had to be the 3.4v battery? I notice the mah on the 3.6 is 2.1? and is 1.4 on the 3.4v battery. Just don't want to mess up my scope 