I thought it interesting that the highest constant current in the performance charts wasAfter reading this thread, I recently went looking for Duracell Procell 9V batteries, 6LR61. These are generally not sold at retail, they come from the industrial tool and parts shop. I was expecting to find the Procell orange packaging, instead I found two different varieties. Procell Intense and Procell Constant. Different colors, different labels. Two seemingly different flavors marketed to different applications. Marketing being the key word here. Very important step in extracting maximum revenue from the consumer is to create "value". One way to do that is to 1) Create the [appearance] of a problem, and 2) Offer the consumer the solution.
Product data sheets for the two batteries are attached. Cynicism aside, I'm sure these are both high quality products, but for all practical purposes, but the two versions of the Procell appear to be nearly identical within testing and manufacturing tolerances other than the hip new labeling. Oddly, the Intense actually has marginally more constant current capacity than the Constant...
Remember, if you cannot compete on price or quality, that leaves fraud. Which we shall call marketing....
That leads me back to wondering how to do a capacity test on these batteries that is applicable to our usage. I’m still trying to figure it out. But —
I wonder if I can program something like a 1.5s full on every few minutes cycle into the Emeter II’s servo testing function. Then I could use a small brushed-motor electronic speed control with an appropriate power resistor in the place of the motor and do a cyclic test that would be sort of representative…. Hmmmmmm.
I’ll have to buy a quantity of resistors because I don’t see any quick way to get just the ones I’d need for less than buying a $10 assortment on Amazon…. But that way I could simulate both an Estes igniter/starter (0.7 ohms) and an e-match (1 ohm) without burning up a bunch of them.
I will take apart one of the Voniko batteries after I run it all the way down testing it and post pictures here. If I go ahead and get the lithium-based ones I will do likewise for that one.
Added: a little high-discharge-current 2s LiPoly like the one in the post just above might well be a good choice for a small launch controller, too.
Added later: Voniko lithium 9V and pack of resistors ordered. Should be here tomorrow.
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