The old batteries (Eneloop) have held only half a year but I have also used directly and not previously charged to 100%. Now I have installed 2 stations with fully charged batteries Amazon and a station with the Eneloops. The old batteries are relatively the same time (3 days difference) failed, ie the comparison test should be meaningful.
To date (2 months) to see the voltages from relatively equal. I will continue to monitor and update my review.
Update: Well, after about 4 months at two stations had to be changed the batteries. The two sets have failed every 2 days. Also, the pattern of the voltage drop at the end were almost identical. The batteries are now been quickly than before but I think this is due to the higher temperatures and humidity in the summer.
