re:changing batteries. I could see how long they go? However my wind calibration is more important to me (and it seems low so I have to convert it). I expect that the initial calibration period of undefined period will change my calibration. In a personal support question email I received from @WFstaff he wrote: “I believe this initial learning period with winds can be re-started by opening and closing the battery door on the unit.” So Changing batteries might change my calibration and therefore my personal conversion. Others must have compared battery life. This data sheet might help comparisons: http://data.energizer.com/pdfs/l91.pdf The milliAmp-hours capacity graph includes a dotted line to compare Alkaline. It shows how at very low current the advantage of Lithium is reduced because an alkaline battery produces more power at lower currents. And here is a data sheet for Alkaline: http://data.energizer.com/pdfs/e91.pdf It shows at 25mA an Alkaline battery lasts 3000mAh. While the Lithium Ultimate at 25mA lasts 3500mAh. But I live where it never freezes so the temperature effects to Alkaline are not a problem. You might like to read this: http://data.energizer.com/pdfs/alkaline_appman.pdf
kind regards Ian
2 Likes