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Great AA Alkaline Battery Test (2016)

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Re: Great AA Alkaline Battery Test (2016)

#121

Post by intrasight »

walrus01 wrote: post #115

something that didn't exist in 2016 and does now, are AA batteries that are composed of an internal lithium ion cell, a DC-DC converter for 1.5VDC output to the end terminals, and internal 5V-USB to li-ion charge controller circuitry. With a USB port literally built into the body of the battery. They're more expensive, but can pay for themselves... https://www.amazon.com/AA-Batteries-ANVOW-Rechargeable-Capac... there…

I'd seen those in the past. Prices have come down. Am curious what are the benefits over NiMN.

Re: Great AA Alkaline Battery Test (2016)

#122

Post by ChrisLomont »

dragontamer wrote: post #36
iancmceachern wrote: post #35

Earlier quoted context omitted.

I wonder what phenomenon is driving this. A spent battery weighs more?

The physical chemistry changes as a battery is spent. The internal chemicals are being converted from one molecule into another. Its not surprising to me that the two different chemicals have different physical properties. (Elasticity, density, who knows? They're a fully different chemical once the electrons move around)

Almost all the mass of a molecule is in atom nuclei, and these masses do not change under any battery chemistry I've ever seen.

The only way to change mass appreciably is to add or remove atoms from the interior of the battery.

Re: Great AA Alkaline Battery Test (2016)

#124

Post by exhilaration »

iancmceachern wrote: post #35
silisili wrote: post #33

On the subject of AA alkaline batteries - one thing I learned a long time ago somehow I'll share that people seem amazed by is that you can approximate their charge by bouncing them on a hard surface. Drop an AA battery negative/flat side down an inch or two onto a hard surface like a counter or table. A new battery will just land and thud. A dead battery will bounce repeatedly(you'll hear it more than see it).

I wonder what phenomenon is driving this. A spent battery weighs more?

Previously discussed on HN: https://news.ycombinator.com/item?id=21693423

Re: Great AA Alkaline Battery Test (2016)

#125

Post by walrus01 »

intrasight wrote: post #121
walrus01 wrote: post #115

something that didn't exist in 2016 and does now, are AA batteries that are composed of an internal lithium ion cell, a DC-DC converter for 1.5VDC output to the end terminals, and internal 5V-USB to li-ion charge controller circuitry. With a USB port literally built into the body of the battery. They're more expensive, but can pay for themselves... https://www.amazon.com/AA-Batteries-ANVOW-Rechargeable-Capac... there…

I'd seen those in the past. Prices have come down. Am curious what are the benefits over NiMN.

should be little to no memory effect unlike NiMH

Re: Great AA Alkaline Battery Test (2016)

#126

Post by exhilaration »

intrasight wrote: post #121
walrus01 wrote: post #115

something that didn't exist in 2016 and does now, are AA batteries that are composed of an internal lithium ion cell, a DC-DC converter for 1.5VDC output to the end terminals, and internal 5V-USB to li-ion charge controller circuitry. With a USB port literally built into the body of the battery. They're more expensive, but can pay for themselves... https://www.amazon.com/AA-Batteries-ANVOW-Rechargeable-Capac... there…

I'd seen those in the past. Prices have come down. Am curious what are the benefits over NiMN.

At first glance, capacity seems to be the main benefit, from the above link:

Battery Capacity: 3400mWh

Compare that to Eneloop pros: 2500mAh

Using this converter https://convert-formula.com/mwh-mahz 3400mWh at 1.5v is 2256mAh so the Eneloop pros actually have more capacity.

Re: Great AA Alkaline Battery Test (2016)

#127

Post by walrus01 »

exhilaration wrote: post #126
intrasight wrote: post #121

Earlier quoted context omitted.

I'd seen those in the past. Prices have come down. Am curious what are the benefits over NiMN.

At first glance, capacity seems to be the main benefit, from the above link: Battery Capacity: 3400mWh Compare that to Eneloop pros: 2500mAh Using this converter https://convert-formula.com/mwh-mahz 3400mWh at 1.5v is 2256mAh so the Eneloop pros actually have more capacity.

Downside being that the eneloop pro needs its own charger, these should be able to charge from any phone charger, or come with their own 4-to-1 usb cable.

Re: Great AA Alkaline Battery Test (2016)

#128

Post by adwi »

Tl;dr from author in comments:

> The best choice is to avoid disposable batteries where possible and use low-self-discharge Ni-MH cells such as the Sanyo/Panasonic Eneloop. Even though the upfront cost is higher, it only takes a few recharges (in some cases, less than ten) to be financially (and possibly even environmentally) ahead.

Re: Great AA Alkaline Battery Test (2016)

#129

Post by alibert »

intrasight wrote: post #121
walrus01 wrote: post #115

something that didn't exist in 2016 and does now, are AA batteries that are composed of an internal lithium ion cell, a DC-DC converter for 1.5VDC output to the end terminals, and internal 5V-USB to li-ion charge controller circuitry. With a USB port literally built into the body of the battery. They're more expensive, but can pay for themselves... https://www.amazon.com/AA-Batteries-ANVOW-Rechargeable-Capac... there…

I'd seen those in the past. Prices have come down. Am curious what are the benefits over NiMN.

Constant 1.5v and weight.

Re: Great AA Alkaline Battery Test (2016)

#130

Post by msie »

symby wrote: post #92

Not included in this analysis is leakage rate... by which I mean ooze leakage. I have found that some batteries have a much greater likelihood of leaking ooze than others (yeah Rayovak, I'm looking at you!) Except in the case of crappy toys, the damage that this causes radically outstrips the cost of the battery. As a result, I buy batteries not based on electrical performance, but track record in not ruining the thi…

I have had success in removing the battery leakage from my toys. Baking soda + water on a q-tip works really well.
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