| General > General Technical Chat |
| 30 year old AA cells |
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| Cerebus:
It's relatively high drain, but it's on a long duty cycle. What, 3-4 mins a day for domestic usage, so a duty cycle of 0.005%? Plenty of time for the battery to recover for tomorrow. |
| SilverSolder:
Zinc carbon batteries eat up their zinc casing as part of normal operation, so they are almost bound to leak eventually... not sure they are better than even Duraleaks in this regard? |
| tom66:
--- Quote from: Circlotron on September 21, 2020, 05:21:22 am --- --- Quote from: edpalmer42 on September 21, 2020, 05:12:21 am ---Those are carbon-zinc cells. <snip> Their in-service life is much shorter than alkaline. --- End quote --- I read somewhere that carbon-zinc and alkalines have approximately the same Ah capacity at low drain e.g. a clock that runs for 12 months. At high drain a carbon zinc falls flat on it's face though. --- End quote --- You read incorrectly. At low drain (~100uA), a carbon-zinc battery has optimistically around a 400mAh capacity, whereas alkaline cells exceed 2000mAh. The only case where you might be correct would be extremely low drain applications where the shelf life and chemical degradation of the alkaline cell loses before the zinc is discharged, but there aren't too many of these applications that use AA/AAA cells. Most of them will use button or coin cells. |
| VK3DRB:
My Farad 808 calculator I bought in 1976 contained two 80mAh nickel cadmium AA batteries. The brand was Sanyo. They were still rechargeable and used until 1998 when they finally died. Those two deserved to be buried with full military honours for many years of dedicated service. |
| vk6zgo:
--- Quote from: @rt on September 22, 2020, 10:54:04 am ---That’s so cool! In my childhood in Australia, the text was different, but we had the same logo and black cat with the nine (lives I guess). I came close to seeking these out for photography for retro toys, but I’m less interested in the collecting lately. --- End quote --- Do you remember their competitor, "Diamond" batteries? They used the same numbering system as Eveready, but prefixed it with a "3". |
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