![[First] USB Rechargeable Lithium-Ion AAA Batteries (4 Pack) $11.99 Delivered @ Kogan](https://files.ozbargain.com.au/n/98/910998.jpg?h=4d7b45ed)
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Rechargeable AAA Batteries
Kogan First limited time deal
USB-C charging
LED indicators. Flash while charging, stay solid when full.
Lithium-ion battery.
[First] USB Rechargeable Lithium-Ion AAA Batteries (4 Pack) $11.99 Delivered @ Kogan
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only 400 mAh
At 3.7V - that's 1.48Wh. For comparison, a 1.2V AAA at 1000mAh is 1.2Wh, but that's obviously a lower voltage so can't typically be used for the same purposes.
The specs indicate 1.5v. What does 3.7v have to do with this product?
Where does it say these lithium batteries are 3.7V? On the Kogan website it shows 1.5V and you can even see 1.5V on the photo of the batteries.
But also nominal is 1.5v, which is unique amongst rechargeable AAAs
And this is why mAh are bullship units for batteries.
All those 1000000000000 mAh powerbank deals that people post. Do you think they are measured at the output voltage?
Hell no, they are all based on 3.6 or 3.7V nominal cell voltage.So what are they using here? Whatever is bigger, I suppose :-)
A AAA-size li-ion cell is called a 10440, and typically has 350mAh at 3.7V = 1.3Wh.
400 @ 1.5V is half that. Leaves plenty of space for the charger and buck converter.
why
M.C.A
Costco also has some, not sure how they compare: https://www.costco.com.au/Household/Electrical/COAST-ZITHION…
These have an internal 3.7V rechargeable battery plus a voltage converter. Most batteries of this type quote mWH in the specs so there is no confusion. Quoting mAH is confusing.
Also, the voltage converter is electrically noisy, which doesn't bother most devices. I wouldn't buy without seeing reliable reviews.
My experience.
I bought a bunch of these 1.5V rechargeable lithium AAAs for devices like computer mice.
They are good that they are a full 1.5V output right up to the minute they go flat. None of this nonsense of only being 1.2V because they are rechargeable, and not working in some devices. And that when they do go flat you just plug in the cable and recharge them. Over and over.
They are not so good that they go flat suddenly. No warning. Suddenly the mouse or whatever stops working. And they go flat surprisingly quickly given their claimed capacity. So it happens quite often. And because they have a 3.7V to 1.5V converter chip in them their maximum output is limited to that capacity, which is not very high.
Really a far better solution would be for manufacturers to build small devices like mice to take a 3.7V lithium rechargeable.
WARNING: Do not put these in devices like smoke alarms. They may not have the capacity to last the year between routine battery replacements. And smoke alarms use voltage dropoff to warn you the battery needs replacement, and expect to still have enough battery capacity left then to power the warning. This battery has no droffoff until it suddenly goes to zero. So you may end up with a non-working alarm without knowing.
If I was doing it again I'd probably just pair a 3.2V lithium AAA with a AAA spacer so I got the equivalent voltage as from a pair of fresh 1.5V AAAs.
EDIT: Oddly, I can't seem to find 3.2V AAA lithiums. Only 3.7V AAA. But there are 3.2V AAs available.
Wouldn't the .5v difference relate to peak and nominal voltage? As in they're basically the same?
Not the same. There are several different "chemistries" in lithium rechargeable batteries.
The commonest chemistry is called NMC, standing for Nickel-Manganese-Cobalt, as these are the three metals used to manufacture the batteries. NMC batteries are 3.7V over most of their discharge.
Another chemistry, known for having a longer life and not needing "conflict minerals", is "lithium iron phosphate", often shortened to LiFePO4 or LiFe or LFP. These batteries are 3.2V over most of their discharge.
Apparently these can also be charged using induction charging like on an induction stove
I think you mean "like an electric toothbrush" . Induction stoves work very differently - don't try to charge your batteries on them :-)
Unless you know its going to work and do so safely, that sounds like an incredibly dangerous thing to do. You are talking about a lithium battery, and doing something to it that could heat parts of it up to the point where it ignites.
"Apparently" is far from a good enough assurance that it'll work on not set fire the battery and your kitchen.
EDIT: As bargaino says, perhaps try it on an induction charger. Certainly not on an induction stove.
So I read that as, yes go ahead and put said lithium batteries in cast iron skillet which then goes on top of induction stove for diy charging. Got it. 6pm news here I come
Exactly. It also helps heat up the skillet so it’s kind of like killing three birds with the one stone
I got some of these from AliExpress (AA version), they're terrible and don't hold charge well.
Glad I only got 4 to try out.
Technologia