It's a Battery...
It's a battery... it works. There HAS been a slight improvement from the older read models versus the newer silver models (which is what you will get)... there is a "cut out" both at the left and right for the wire to slide in to up top where you plug it in versus just one side like the red version. Oh, and the new versions charging indicators are much better... the old red one you had to use the RED/GREEN LED on the charging unit where as this version uses the 4 LEDS on the actual batteries to show more detail as to how far along the charge is. It will blink all 4 LEDS in a row when first charging... then 1 LED will remain solid while the other 3 blink... then 2 remain solid... then 3... then finally when the battery is charged all 4 remain solid. Oddly, the RED/GREEN LED on the charging unit turns green WELL before the batter is fully charged... probably an hour or more before... around when it goes to 3/4 charged according to the on-batter LEDs. I wonder if I've been "undercharging" my red batteries forever now? In any case, the new version seems to do it's job thus far, though admittedly I am only ad my 2nd charge for the product... the real test will be this time next year... or the year after.
ProsNew model has "notch" on both sides of header.
New model has better charging LED display (on battery).
I guess silver is nicer looking than red?
ConsNone thus far. It DID come fully discharged whereas the last two sets of RED batteries I've gotten had come partially charged. I'm not sure if that's really a CON though?