General > General Technical Chat

Rechargable vs. Non-Rechargable Batteries - AA/AAA Size

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Miti:
And these are the new models. Still made in Japan.

cortex_m0:

--- Quote from: deadlylover on July 23, 2021, 12:35:18 pm ---Ughh this is from memory, but if you use and abuse the cells then you'll get something like ~50 cycles for high cap, and ~300 for normal capacity cells. After that the internal impedance is too high for extreme discharge applications, so they will spend the rest of time in remote duty after that.

--- End quote ---

What is "use and abuse" in your experience? The only consumer electronics where I've observed poor performance from low discharge NIMH batteries was a digital camera that probably had the under voltage lockout set too low for NiMH. You'd get like 6 photos from a freshly charged set.

retiredcaps:
Project Farm Which AA Rechargeable Battery is Best after 1 Year? Let's find out! Eneloop, Duracell, Amazon, EBL



He measures internal resistance in this video.

deadlylover:

--- Quote from: cortex_m0 on July 24, 2021, 12:44:28 am ---What is "use and abuse" in your experience?

--- End quote ---

Deep discharges in flashlight applications. I think camera flashes were another killer.  :P

For better or worse, lots of equipment struggle to work below say 1.1V or 1.0V per cell anyway.

So I think realistically we can get a more reasonable ~100-150 cycles out of the high capacity variants, but I wanted people to know that there are certainly use cases where you can only get ~50 cycles before the cells start dropping like flies (which is ten percent of the advertised claims, I used to see this a lot on the flashlight enthusiast forums).

You can find some cycle testing on aacycler.com.

retiredcaps:
I finally found my first set of AA Eneloops.  They are 10+ years old.  Initially, there were used in a D cell sized shell so I could use them in a D cell battery powered device.  It was used for 8 months daily and recharged to full daily.

Afterward, the set went into a monitoring/listening device for about 3.5 years.  It was used daily, last about 12 hours and then recharged to full daily.  So it's easily got over 1,500 cycles, maybe even 2,000, but I will be conservative and say 1,500 cycles. The discharge rate for this set is basically constant with little to no spikes or high current demands.

My charger is a BT-C700 and using the quick test function to measure internal resistance just now, I get 113 and 97 for the initial set.  On a set of random 5+ year old Eneloops with unknown cycles, I get 53 and 54.  On a set of 11 year old Energizer non lsd 2300 mAh, I get 950 and 979.

The last time I ran a capacity measurement on this initial set, I think it was still close to 1900mAh.

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