TIGER HEAD HI WATT BATTERY HK CO LTD via Amazon has
8-pk 3500mWh HW Rechargeable AA Batteries w/ Charger on sale for $23.99 - $9.60 (apply promo code
M8QY9IRX at checkout) - $1.20 (5% Subscribe & Save discount) =
$13.19.
Shipping is free with Prime or on $35+ orders.
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Typical results:
1880mAh @0.5A-81% of claimed capacity
1700mAh @1.0A-73%of claimed capacity
1575mAh @1.5A-68%of claimed capacity
1370mAh @2.0A-59%of claimed capacity
THIS MODEL DOES HAVE A VOLTAGE STEP DOWN.
It drops to ~1.1v for around 480mAh.
This allows SOME devices to notify the user that the voltage has dropped instead of cutting off abruptly like most of these kind of batteries.
MUCH longer time spent at 1.1v, at the expense of less time spent at 1.5v.
Voltage sensitive devices will see less capacity.
If you read the 3* reviews you'll see some people are getting what appear to be defective batteries. All mine work.....so far. Long term reliability and self-discharge are unknown.
SinceHoly 3500mWh are decent getting ~85-90% of claimed at 0.5A. Short time used. No idea of long term reliability.
Dracutum 3000mWh.- on a percentage of claimed capacity this is one of the best ones I have reaching 90-95% at 0.5A draw. They sustain 70-73% at 2.5A which is pretty decent.
The Dracutum ALSO HAVE VOLTAGE DROP, to 1.1v. BUT, they only do that for ~50mAh, so there is a BRIEF notification window of low voltage, but little loss of working capacity. This is the first brand that I've owned that does this.
ALL of them were bought on some kind of special, usually ~ $2-2.50/cell. I would not buy these for $4-5/cell but I really don't NEED any of these, NiMh are fine for me most of the time.
I don't have a door lock or critter cam. Those things have an entirely different demand and usually DON'T do well on NiMh, or alkaline. So those folks end up with lithium primary like $2-2.50/battery for disposable.
For excellent rechargeable lithium AA, and willing to pay the price, look at the Xtar brand.
(Note-Cicnod and JWWYJ are both not too good. Imren are OK but only if bought cheaply.
If you are one of those people that HAS to have USB-direct charging, you WILL give up some capacity fo it. Not much room in that tiny can for chemicals AND electronics). I have not found any brand in AAA size that is even decent except Tenavolt. Just too tiny and the manufacturers routinely mess this up by making them USB-direct charge. Stupid. .
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I only looked for a few minutes so I am sure more can be found:
$19.99:
https://a.co/d/7IZdpet
$15.99:
https://a.co/d/3pZl9Zu
$14.99:
https://a.co/d/b3p7Ias
$10.44:
https://slickdeals.net/share/android_app/t/18728128?referr
$9.49:
https://slickdeals.net/share/android_app/t/18727765?referr
The batteries looks similar to Dracutum.....but then MOST of them do.
I think they may all come from just a few factories. WHY there are so damn many 'chargers' and variations in battery capacity, and a slew of names, I have no idea. Seems pretty stupid to me. But that's idiot rampant capitalism. Make e-waste, damn the environment while touting your device will help save it.
Cable will likely be A>C.
Almost tempted to buy those at that price (extremely cheap.....why?) just to test them out. Very few people actually TEST them, and most of the reviews on Amazon for batteries of ANY SORT anymore are HIGHLY suspect, and woefully lacking in real data. 5* reviews are as worthless as 1* much of the time.
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SinceHoly 3500mWh are decent getting ~85-90% of claimed at 0.5A. Short time used. No idea of long term reliability.
Dracutum 3000mWh.- on a percentage of claimed capacity this is one of the best ones I have reaching 90-95% at 0.5A draw. They sustain 70-73% at 2.5A which is pretty decent.
The Dracutum ALSO HAVE VOLTAGE DROP, to 1.1v. BUT, they only do that for ~50mAh, so there is a BRIEF notification window of low voltage, but little loss of working capacity. This is the first brand that I've owned that does this.
ALL of them were bought on some kind of special, usually ~ $2-2.50/cell. I would not buy these for $4-5/cell but I really don't NEED any of these, NiMh are fine for me most of the time.
I don't have a door lock or critter cam. Those things have an entirely different demand and usually DON'T do well on NiMh, or alkaline. So those folks end up with lithium primary like $2-2.50/battery for disposable.
For excellent rechargeable lithium AA, and willing to pay the price, look at the Xtar brand.
(Note-Cicnod and JWWYJ are both not too good. Imren are OK but only if bought cheaply.
If you are one of those people that HAS to have USB-direct charging, you WILL give up some capacity fo it. Not much room in that tiny can for chemicals AND electronics). I have not found any brand in AAA size that is even decent except Tenavolt. Just too tiny and the manufacturers routinely mess this up by making them USB-direct charge. Stupid. .
https://www.amazon.com/dp/B0DR5SFK8R
They claim to be 2800mAh. One 3* review discharged them via a multi-chemistry 'smart charger' and got ~2100mAh, about 75%. Not great, fairly typical of the false claims these seem to always have.
These use resistance discharging, so generally only 0.5A due to heat. My device is more accurate, and can go higher, but that's 'good enough'.
You CAN do discharge testing (only) of these cells on a smart charger. You CANNOT charge them with one. .
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(Note-the built-in electronics DO HAVE LOW LEVEL PARASITIC DRAIN. This is a characteristic of this kind of battery. HOW MUCH is battery brand specific and can be highly variable)
The Amazon reports on batteries are almost completely based on variable and purely anecdotal use patterns to the point of being almost useless.
I use a few of them in remotes, thermostats, and weather monitors-long term, low drain devices. They 'seem' to do pretty well, but I'm not documenting that, so I don't REALLY know. I don't have the patience either.
Some people put them in SOLAR LIGHTS, and are disappointed they don't work.. Clueless, unfortunately.
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