has the latest version think it was 4.07

i have been using mine without a shanty

i bought my lx-7 in november first one i have ever owned but know how to opperate overall had a little time to figure out it functions before 1st use. i really like it have only had a few issues with it.first being that dynamic depth seems to be glitchy and showing black triangles at times and second is that the cold weather seems to affect the battery life while not being in a shanty it lasts 3 to 4 hours says low voltage and shuts down.bring home and a hour later turn it on and at 11.5% battery life

any info would be greatly appreciated