Got a pretty good handle on how long they last, gps about 3 months on dick smith batterys god knows how long on some decent lithium things(mark camp or boat and turn off, turn on and mark point of interest like a wallow turn off) 99 percent of the time its in my bum bag or pack turned off,areas i know well its at home) Headlamp will do six or seven 3hour walks in total darkness on dick smith batterys.
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