Woot! has
8-Pack Amazon Basics AA Rechargeable 2400 mAh High-Capacity Batteries on sale for $8.99 -
$3 off when you apply code
BATTERIES at checkout =
$5.99.
Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is otherwise $6 per order.
Note: Limit one use per customer.
Thanks to Deal Hunter
NavyWife for finding this deal.
Features:- 8-pack of AA rechargeable NiMH batteries (2,400 mAh)
- Ideal for devices with high power or continuous drain like game controllers, wireless devices, toys, and more
- Can be recharged up to 400 times with minimal power loss
- Maintains 50% capacity for 1 year
- Shelf-life up to 5 years
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Yes, people ignore the value of these batteries. Pretty much nothing else comes close in terms of price per battery or price per Ah. While EBL and a bunch of others are also cheap, nearly all of them seem to have massively overstated capacities. The 2500mAh EBLs I tested were actually roughly 1850mAh. The Amazon Basics batteries I've tested average at least roughly their rated capacity, in some cases greatly exceeding it. The made in China 2400mAh ones I tested mostly exceeded their rating.
While costly, actual Eneloops do seem to be the best quality. They are extremely consistent and come the closest to precisely hitting their rated capacity (no more, no less). I can't say for certain but I suspect at least some of the rebranded Eneloops are either rejects or ones that didn't meet the quality standards to be actual Eneloops. Some of the ones I tested (especially the Watson MX/CX) were much less consistent and showed evidence of high self-discharge. Interestingly, the 2550mAh Watson MX averaged slightly higher capacity than the 2600mAh Eneloop Pros.
For starters, those are AAAs, not AAs. Secondly, they're ten times the price ($7.50 vs $0.75 each). I don't know where you got 2250mWh from but that's just plain wrong. Lithium-ion AA/AAA are a whole different beast, and not always for the better. Nearly all of them are from no-name companies, of questionable quality, and use proprietary chargers. They almost always have higher self-discharge than a decent NiMH because they have to continuously power the regulation circuitry. That circuitry can also cause interference or other issues with some devices. The ones with built-in USB charging sacrifice considerable capacity to accommodate that feature. The ones you linked are 750mAh. A standard capacity NiMH is usually at least 800mAh. Some can reach almost 1100mAh. Also, the reviews for those batteries are almost entirely from people who got them free. Not that I put too much faith in Amazon reviews anyway, since I've seen plenty of garbage products with seemingly great reviews. In my opinion, lithium-ion AA/AAAs are more for niche purposes, powering devices that won't tolerate NiMH.
EBL is not a good brand. Most of their batteries have outright fraudulent ratings.
Manufacturing location is not a reliable indicator of quality. There are garbage batteries made in Japan and quality ones made elsewhere, including China. In recent years, Amazon sells ones made in either Malaysia or China. Sometimes it even varies depending on the quantity you buy.
They definitely do. Cycle through the various listings/quantities and you'll see it vary between made in China and made in Malaysia.
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But, for less than $1/battery and free delivery they seemed worth an experiment.
Background: I've been using NiMh and Lithium rechargeables heavily for over 15 years. I've got a bunch of well tested and vetted 'smart chargers' that have been shown to do decent and reliable charging.
About 5 years ago to step up my analysis I bought a couple of dedicated constant current dischargers + cradles that also can reliably test internal resistance. ZB206+ Battery Tester [sevarg.net]
The smart chargers with sliders all suffer from 2 main problems:
1. The sliders have variable resistance that tends to get higher with use over time so their internal resistance tests are not consistent.
2a. Discharge is NOT constant current. As the voltage goes down, the current also goes down producing an erroneous reading on capacity.
2b. Due to the limited nature of resistance discharging and resulting heat they produce they are limited (sometimes seriously) in the discharge current they can utilize.
I just ran my 8 batteries through the first battery of tests. They were manufactured in Malasia 2024. They all came charged to ~1.28v. They all charged up just fine. Termination seems consistent and solid (EBL are pretty bad at termination consistency.) Construction appears above average.
Internal resistance after charging and cooling down = 20-22 for all. Quite good.
I ran the lot of them through 3 cycles at: 1A, 2A, and 0.5A. Consistency was pretty good. Here are the bottom and top results from the lot of them. I'll just give the 0.5 and 2A results.
0.5A: 2160mAh > 2240mAh
2A: 2160mAh >2200mAh
As you can see they handled 2A about as well as 0.5A.
NONE made it to 2400mAh, but I'm not the least bit surprised about that. Most batteries do not.The factories use much lower discharge rates usually.
Long term results can only be found over time with use. The HUGE problem with that is almost inevitably those particular batteries will no longer be available several years from now.
The other big problem is user (ab)use. A lot of people seem to think they know what they are doing, how to take care of rechargeable batteries and it's quite evident they do not. The VAST majority of reviews about batteries on Amazon are useless from people that haven't got a clue what they are doing,
1. The sliders have variable resistance that tends to get higher with use over time so their internal resistance tests are not consistent.
2b. Due to the limited nature of resistance discharging and resulting heat they produce they are limited (sometimes seriously) in the discharge current they can utilize.
0.5A: 2160mAh > 2240mAh
2A: 2160mAh >2200mAh
As you can see they handled 2A about as well as 0.5A.
NONE made it to 2400mAh, but I'm not the least bit surprised about that. Most batteries do not.The factories use much lower discharge rates usually.
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