The batteries are no longer accepted by the greedy equipment like cameras (real) end in clocks and low power devices or in my old set keyboard / mouse (very greedy mouse), again the results were as quattendus.
Prior to performing these tests, I had to get my electrical tester, put the cables, select the correct function and then juggle the + and - terminals, today this is over.
FYI, with prices fluctuating based on availability and seller, I paid 4.57 lai.