![]() BUT I know from personal experience with batteries that a FAST light touch is needed when soldering anything to a battery. I am pretty good with a soldering pen as I own an audio cable company and spend hours every day soldering all manner of electric stuff. Yes, I know the trick of using a little button magnet on the flat-top batt’s pos pole, and it works great, BUT in some decidedly nontechnical tests, I found that by tapping the battery on the side against a table, I could eventually move the magnet so that it would contact the flashlight barrel, which would create an uncontrolled short in an unprotected cell, something we all like to avoid Besides it seems to make more sense to mod the flat-top 18650s with some kind of button so they work in every flashlight. ![]() I could ADD a spring to the battery compartments of several lights, but a few would be really hard to mod this way because the way the internals are set up. ![]() Since flat-tops are flat-tops, they don’t work in springless batt compartments, no surprise there, because they can’t make contact. I would like to use nonprotected li-ion batteries in several flashlights that do not have an internal spring in the flashlight battery compartment. The flat top will be called flat.Anyone know what to use as a button to solder or otherwise attach to the positive terminal of flat-top 18650 batts? In my battery reviews I will use SB for the small diameter button top and LB for the large diameter button top. The last picture shows the minus pole on AW's flat top battery, there are some bumps, making it possible to connect to a flat plus pole, i.e. the plus pole of the connection battery must be raised more than the plastic thickness to make connection. On the next picture is a typical battery bottom, it is flat and has some plastic around the edge, i.e. ![]() The first picture shows a button top that connects with another battery. equipment that needs two or more batteries, flat top batteries can also be a problem. When connecting batteries in series, i.e. only batteries with a small plus pole may be able to work in this kind of light. This may restrict the size of the battery plus pole. Some flashlights has a ridge or some bumps around the plus pole as a mechanical polarity protection. But the last one has only a flat circuit board and will not work with a flat top battery. The first one has a raised top, the second one has a spring, both will work with both button top and flat top batteries. Here is the battery connection in 3 flashlight heads. On the second battery the ruler makes contact with plastic first, i.e. the plus pole is raised above the plastic. These two batteries has much more flat plus pole, but only one is a true flat top, the other is a button top with a large diameter button.Ī ruler on top of the batteries, on the first one the plus pole makes solid contact with the ruler, i.e. The first two pictures show some classic button top batteries, the plus pole is raised above the rest of the battery. All pictures show 18650 batteries and equipment, but the flat/button top factor does also exist in other sizes. This is a small difference, but sometimes it is the crucially factor between working or not working equipment. Here I am looking at the plus pole on the battery, it can either be raised (button top) or not (flat top). LiIon batteries exist in many sizes, but even within the same size, there are differences. Battery, button or flat top Battery, button or flat top
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