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Do you discharge your NiMH batteries?
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<blockquote data-quote="WayneF" data-source="post: 446939" data-attributes="member: 12496"><p>Batteries are like lead-acid car batteries, always keep them charged, continually with trickle chargers when necessary. It's tough on their life to run low or to sit low. True of deep cycle batteries too, but they are made different to stand up a bit better to it. They are also better off when recharged early and often. Light cycles are better then deep cycles.</p><p></p><p> Sitting low is not hard on NiMH (said better stored around 40%), but charge and discharge is hard on them. Specs give us a life expectancy of number of times. Which is many, but I see no point of intentionally adding to that usage, esp not with deep cycles. </p><p></p><p>The only exception is NiCd, said to have a memory for repeated same conditions (said of satellites circling the earth, which is extreme, precise and frequent repetition, but other uses seemingly are exaggerated). Most of the devices (toothbrushes, drills, etc) with NiCd provide a continuous charging stand for them, which is still recharge early and often.</p><p></p><p>In the past when I was dumber, I tried twice to intentionally fully discharge NiCd (like in a dustbuster), as seemingly instructed, but it ruined (killed) the batteries both times. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p>My notion now is that it's better NOT to do stupid stuff. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>I have a 2008 Prius, which its electric motor is powered by well more than a hundred NiMH cells (I forget exact number, but in series, its about 200 volts). These are simply just D cells, except made square, and multiples packed in steel cases. All in series, and about 7 AH capacity at 200 V, NiMH.</p><p></p><p>Point is Toyota provides computers to NOT let them be charged over about 80% and NOT under about 40% (ballpark, I forget exact numbers). The batteries are simply cut off when low, and you're on your on with just the gas engine. Electric is only used for acceleration, but driving up Pikes Peak was interesting, losing half of capability about half way up. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>But with these 80% to 40% limits, they warranty the batteries for 8 years. And there are few stories about the batteries. Mine is 7 years now. I have replaced the 12V battery once.</p></blockquote><p></p>
[QUOTE="WayneF, post: 446939, member: 12496"] Batteries are like lead-acid car batteries, always keep them charged, continually with trickle chargers when necessary. It's tough on their life to run low or to sit low. True of deep cycle batteries too, but they are made different to stand up a bit better to it. They are also better off when recharged early and often. Light cycles are better then deep cycles. Sitting low is not hard on NiMH (said better stored around 40%), but charge and discharge is hard on them. Specs give us a life expectancy of number of times. Which is many, but I see no point of intentionally adding to that usage, esp not with deep cycles. The only exception is NiCd, said to have a memory for repeated same conditions (said of satellites circling the earth, which is extreme, precise and frequent repetition, but other uses seemingly are exaggerated). Most of the devices (toothbrushes, drills, etc) with NiCd provide a continuous charging stand for them, which is still recharge early and often. In the past when I was dumber, I tried twice to intentionally fully discharge NiCd (like in a dustbuster), as seemingly instructed, but it ruined (killed) the batteries both times. :) My notion now is that it's better NOT to do stupid stuff. :) I have a 2008 Prius, which its electric motor is powered by well more than a hundred NiMH cells (I forget exact number, but in series, its about 200 volts). These are simply just D cells, except made square, and multiples packed in steel cases. All in series, and about 7 AH capacity at 200 V, NiMH. Point is Toyota provides computers to NOT let them be charged over about 80% and NOT under about 40% (ballpark, I forget exact numbers). The batteries are simply cut off when low, and you're on your on with just the gas engine. Electric is only used for acceleration, but driving up Pikes Peak was interesting, losing half of capability about half way up. :) But with these 80% to 40% limits, they warranty the batteries for 8 years. And there are few stories about the batteries. Mine is 7 years now. I have replaced the 12V battery once. [/QUOTE]
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