About IMR 18650
With all of the different type of batteries on the market, it can get pretty confusing figuring out what you need. The IMR 18650 batteries fall into the lithium-ion category and they are rechargeable. IMR is simply a form of ion battery that uses LiMns204 as a cathode component. It is pretty similar to the other kinds of ion batteries, except that it cannot be overcharged, which is a bonus when dealing with batteries that you forget to take off of the charger. The 18650 cell batteries are about 65 mm long and generally have a flat top rather than a button top. This means that you have to use them in compatible electronic devices because they are not interchangeable with standard AA batteries, even though they look like they are the same size. Find single IMR 18650 batteries on eBay so that you can swap out batteries in the charger. Always have a freshly charged set of batteries waiting for you in case of an emergency.