Good spacers, but some effort to work in some devices
These Eneloop spacers are decent quality, unlike some of the other  battery adapter brands.  However, they may not work for your application with out some messing around.<br /><br />First, when you slide the AA battery in, the positive end slides inside four little arms to make contact with the positive terminal of the adapter.  On a couple  of these spacers that I have, you need to use a little screwdriver to move one of the arms back so that the battery will slide in - no big deal.<br /><br />The bottom, negative end of the spacer is just open, so that the AA battery will slip out if it is not firmly retained by a spring or terminal inside your device.<br /><br />Another potential problem is that some of the springs designed to hold D batteries will have an inner coil that is too big to hold the AA battery base (as in many flashlights).  The solution to this is to use a 50 cent (half-dollar) coin or similar sized 1-1/4" diameter, thin, round metal disk on the bottom of the adapter to make electrical contact.  You can tape it on with a small piece of masking tape if necessary.  (Obviously, just tape the outer edges of the coin/disk to the adapter, so you still get electrical contact with the spring).  Note that a quarter may work in a pinch, but since it is smaller in diameter it may tilt and fail to make contact.<br /><br />UPDATE: I had previously suggested using a metal washer, but most washers have a hole that is too large to make electrical contact with the base of the battery.
Rating: 4 stars