![]() ![]() to aĬoastdown: 25-28% duty-cycle, approximately equiv. ![]() Main discharge: 41-42% duty-cycle PWM, approximately equiv. So, a simpler rule of the thumb here is that if you can find alkaline batteries at 0.15€ or less per cell, this is alreadyĪ pretty good deal, even if the capacity isn't that great. The effective unit price can be significantly lower (e.g., see the Panasonic Evolta). ![]() Note: most of the tested brands do offer larger packs - 8, 12, 16 cells - which are a more cost-effective package,Ĭonsidering that the total price is not scaled proportionally upwards. Results (in descending order by capacity):Īnd with respect to performance-to-price ratio: to 30Ω load,Ĭoastdown: 50-60% duty-cycle, approximately equiv. Main discharge: 90-91% duty-cycle PWM, approximately equiv. This drains out whatever's left in the cells. Then I subject them to a more gentle discharge (termed coastdown/„last will“ here) at less current, ≤50%. After the main discharge (which consumes 90-95% of the energy), I leave the cells to restįor a few hours. With AA/AAA cells, the discharge is split into two phases. The meter's accuracy should be within 1-2% - it's been tested several times. This accounted for in the capacity calculations and keep that in mind when interpreting the discharge curves. Note that the battery pack isn't discharged with constant current, but is more like a constant-resistance load (~30Ω when using theĪforementioned settings). The described scenario with AA cells takes 12-14 hours to do a discharge. This cycle is repeated until the voltage drops below the desired threshold.
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