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%(qi-html-body-top)sHi, On Fri, Mar 25, 2016 at 01:33:43PM -0300, Werner Almesberger wrote: > AAA (and similar) cells have a mechanical anti-reversal feature: the > protruding "nipple". With a suitable mechanical design, a device can > thus prevent the battery from making contact when reversed. > > But what if this turns out to be too difficult to implement ? After > all, it's already pretty hard to find battery contacts that have an > even vaguely suitable shape. (I.e., that's still on my to do list.) You have to design the case anyway. I would expect that the case is the battery holder, so you only need to insert the contacts. Since it's your design, it's trivial to add such mechanical polarity protection. I find your electronic solutions interesting, but I don't think you need them. ;-) Thanks, Bas