| General > General Technical Chat |
| Ban of non-rechargeable batteries |
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| GlennSprigg:
--- Quote from: james_s on July 01, 2020, 08:17:14 pm --- --- Quote from: GlennSprigg on July 01, 2020, 12:41:57 pm ---Any company, including 'Eveready' etc, can EASILY make normal 'disposable' batteries last 10 times longer!, but deliberately DONT due to simple economics for the company!!! :box: --- End quote --- Find a way to do that and you'll be wealthy almost overnight. A tenfold increase in capacity of any battery technology would be a scientific breakthrough that would be front page news. A company that developed such a battery could patent the technology, charge 5 times as much and rake in billions. Frankly I think you're just talking out your ass. --- End quote --- Hello there friend. I'm actually well aware of what generally comes out of my 'ass'... And it is not pretty... (Maybe yours is 'special' ;D ) However, it has NO relevance to what I said. For decades, in virtually every facet of technology, there was initial ignorance in technological advances. And THAT'S ok mate... as 'we' have learnt a 'shit' (from ones ass) load since then. One FACT remains though, is that companies/people have learnt to 'capitalize' on such 'inventions' considering minimal input!! ONE of those, is the ability/technology regarding batteries, where it is a FACT that companies could produce such batteries to last at LEAST 10X longer, but DON'T because it obviously goes against their business acumen that will result in MASSIVE losses of sales, otherwise... I pose 'my' ASS, against your 'assumed' knowledge any time. Have a 'nice' day... 8) |
| GlennSprigg:
--- Quote from: Zero999 on July 04, 2020, 11:43:45 am --- --- Quote from: GlennSprigg on July 01, 2020, 12:41:57 pm ---The 'problem' I have at times with 'AA' 'Rechargeables' is in the likes of some Cameras etc. Rechargeables are typically 1.2v instead of 1.5v. So "Low Battery" comes on too early!!! :-\ --- End quote --- That's because the device is poorly designed and depending on the current draw, could be wasting as much as half the capacity of alkaline cells. A properly designed device should operated down to at least 1V per cell. I hate this kind of junk. --- End quote --- I think it depends what the original cct was designed for. I was talking about a lot of equipment designed for 'AA' batteries, (ok, often old), that when powered with '1.2v' is quickly underpowered... |
| Zero999:
--- Quote from: GlennSprigg on July 04, 2020, 12:10:51 pm --- --- Quote from: Zero999 on July 04, 2020, 11:43:45 am --- --- Quote from: GlennSprigg on July 01, 2020, 12:41:57 pm ---The 'problem' I have at times with 'AA' 'Rechargeables' is in the likes of some Cameras etc. Rechargeables are typically 1.2v instead of 1.5v. So "Low Battery" comes on too early!!! :-\ --- End quote --- That's because the device is poorly designed and depending on the current draw, could be wasting as much as half the capacity of alkaline cells. A properly designed device should operated down to at least 1V per cell. I hate this kind of junk. --- End quote --- I think it depends what the original cct was designed for. I was talking about a lot of equipment designed for 'AA' batteries, (ok, often old), that when powered with '1.2v' is quickly underpowered... --- End quote --- What sort of device was it: high or low power drain? I would expect a higher power drain load to work better down to lower voltages, than something with a very low current draw. Alkaline batteries typically have a relatively high impedance, compared to NiMH, so a 1.5V battery will quickly drop to 1.2V, with any significant load. If I remember rightly incandescent torches (flashlight) used to use a slightly lower voltage rated lamp, than the battery voltage, so a two cell unit would typically have a bulb rated to 2.2V, rather than 3V. Lower powered devices will probably do poorer on lower voltages, because the cell voltage should remain higher, at low current draws, but I still hope most will function down to 1.2V, with no problem. I think there's a lot of badly designed products out there, built down to a price. I've seen LM78L05 regulators used in devices powered by 9V alkaline batteries, when a low-dropout regulator should have been used instead. Quite often this increases the cost of ownership, compared to spending a little more on the device itself. |
| james_s:
--- Quote from: Raj on July 02, 2020, 07:57:42 am ---out wall clocks having AA, I'm slowly replacing them with my own PoE IoT (local network) clocks cause the standard quarts clocks are too inaccurate for my taste (they go off by 5 minutes every month, donno why so much deviation. --- End quote --- That's odd, do you have wide temperature swings in your house? I have a few different quartz clocks and they typically hold to far better than that, maybe a few minutes at most in a year. |
| SiliconWizard:
--- Quote from: james_s on July 03, 2020, 05:04:04 am --- --- Quote from: SiliconWizard on July 02, 2020, 04:02:28 pm ---- Their shelf life is usually much longer. Corollary is, if you can find some that have been stored, even for a rather long time, they are immediately operational. Can be a life saver. Related fact is that rechargeable batteries are likely to be discharged at the very moment you need them. Especially true for less often used items. --- End quote --- That was true 25 years ago but times have changed. For more than a decade already almost all NiMH cells have been the low self discharge type, they come pre-charged and hold a substantial charge for years. I've left them in a seldom used flashlight for at least 3 years and they still had plenty of charge left. I've had brand new alkaline cells leak faster than modern NiMH cells self discharge. --- End quote --- https://en.wikipedia.org/wiki/Nickel–metal_hydride_battery The low self-discharge type has been introduced in 2005, so that's 15 years ago, not 25. Those cells are pretty good indeed, although with a slighly lower capacity as a trade-off. But even to this day, not all NiMh batteries on the market are of LSD type, far from it (and the average joe is likely to buy non-LSD batteries, because those are cheaper and because they just don't know... or even just because they will tend to go for the highest capacities, which look attractive, which are likely NOT to be of LSD type.) As an example, a typical capacity for NiMh LSD AA batteries is 2500mAh, whereas you can find NiMh AA batteries up to 3000mAh, which are unlikely to be LSD IMHO. Standard NiMh batteries OTOH still have a relatively high self-discharge rate. I've never seen a decent-brand alkaline battery leak within a couple years. If from a major brand and stored properly, their shelf life is longer than 5 years usually, 10 years is not uncommon. A corollary point, but not directly related to shelf life point I was also making is that, due to our habits and a bit of Murphy's law, random rechargeable batteries stored in a drawer are likely to be depleted when you actually need them (partly because of self-discharge, but even with LSD ones, just because you're likely to have stored them discharged unless you're very disciplined.) I for one have a few primary batteries in drawers (never used), but pretty much all secondary (rechargeable) batteries I have, I've used them at least once (I think storing brand-new rechargeable batteries for extended periods of time would be relatively unusual, compared to primary batteries.) So this point was not just about technology, but about the practical aspects. |
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