Energizer rechargeable batteries 1hr AA/AAA plus Charger @Costco (in-store) $13+tax

bcm00re

Dec 7, 2021

1,563 Posts

Joined Dec 2008

Dec 7, 2021

bcm00re

Dec 7, 2021

1,563 Posts

Quote from Commentary

:

Question - If one put fully charged batteries in flashlights, will they drain over time if not used. If yes, any one have a guess as to how long before fully drained?

That depends on several factors. One is the flashlight; some have electronic switches and those can (but don't always) have parasitic drain. If your flashlight has a mechanical switch (and therefore no drain issues) and these are LSD batteries, then I'd say you could probably get by charging the batteries just once a year -- or worst case twice a year. Unlike the packaging on the Energizers I purchased from Costco in 2019 and 2020, these don't say anything about being LSD or coming precharged. That said they are made in Japan and there is only one factory there making NiMH batteries -- and as far as I know everything they make has been LSD. And they make high capacity batteries (2400mA give or take 100mA) that are LSD; the downside of those is usually that you get fewer recharges over the life of the battery compared lower-capacity (1900-2000mA) cells.

Commentary

Dec 7, 2021

4,503 Posts

Joined Jul 2006

Dec 7, 2021

Commentary

Dec 7, 2021

4,503 Posts

Quote from bcm00re

:

That depends on several factors. One is the flashlight; some have electronic switches and those can (but don't always) have parasitic drain. If your flashlight has a mechanical switch (and therefore no drain issues) and these are LSD batteries, then I'd say you could probably get by charging the batteries just once a year -- or worst case twice a year. Unlike the packaging on the Energizers I purchased from Costco in 2019 and 2020, these don't say anything about being LSD or coming precharged. That said they are made in Japan and there is only one factory there making NiMH batteries -- and as far as I know everything they make has been LSD. And they make high capacity batteries (2400mA give or take 100mA) that are LSD; the downside of those is usually that you get fewer recharges over the life of the battery compared lower-capacity (1900-2000mA) cells.

Thanks for the reply.

Is there a limit to how many times these batteries can be recharged before they are no longer functional?

bcm00re

Dec 7, 2021

1,563 Posts

Joined Dec 2008

Dec 7, 2021

bcm00re

Dec 7, 2021

1,563 Posts

Quote from Commentary

:

Thanks for the reply.

Is there a limit to how many times these batteries can be recharged before they are no longer functional?

I'd say around 500 cycles for 2400ish AA cells while around 1000 cycles for 2000ish AA cells. Usually batteries don't just die, they just lose capacity over time and their internal resistance usually increases too.

Last edited by bcm00re December 6, 2021 at 10:08 PM.

Commentary

Dec 7, 2021

4,503 Posts

Joined Jul 2006

Dec 7, 2021

Commentary

Dec 7, 2021

4,503 Posts

Quote from bcm00re

:

I'd say around 500 cycles for 2400ish AA cells while around 1000 cycles for 2000ish AA cells.

Well - that's probably more cycles than I will ever recharge in my lifetime.

Thanks again for the responses.

bcm00re

Dec 7, 2021

1,563 Posts

Joined Dec 2008

Dec 7, 2021

bcm00re

Dec 7, 2021

1,563 Posts

To be clear those numbers came from what Eneloop claims (as those batteries as well as these Energizers are made at the same factory).

ards

Dec 8, 2021

569 Posts

Joined Nov 2015

Dec 8, 2021

ards

Dec 8, 2021

569 Posts

I've been using a 1 hour charger to charge batteries, including Ikea batteries, for over 15+ years. Never had an issue with batteries failing prematurely. I have used this included charger and am quite happy with it and am not concerned about the heat. To be honest didn't even notice any heat beyond what I would consider warm. You want to feel how hot a battery can get during charging? Try a 15 minute charger. I can understand the nay sayers cautioning about using a 15 min charger, but a 1 hour charger is a good comprise that in most cases will not harm the life of the battery.

mm1515

Dec 8, 2021

64 Posts

Joined Jul 2008

Dec 8, 2021

mm1515

Dec 8, 2021

64 Posts

After buying these, I now have too many AAA batteries. Thinking of buying adapters to convert the AAA's to AA size and use in the low-current devices like remote controls. Not sure which adapters are good value though.

budster

Dec 8, 2021

4,044 Posts

Joined Jul 2006

Dec 8, 2021

budster

Dec 8, 2021

4,044 Posts

The charger that comes in the kit is kind of trash and shouldn't normally be used. As other have mentioned, it charges at way too high of a current rate and will decrease the lifespan of the battery. In case the battery runs out, most people probably already have other charged batteries on reserve to use and don't need the functionality of a rapid charger. So I would just discount the charger that comes in the kit and pretend it doesn't even come with it. It sounds like the included charger doesn't even have individual leds for each battery slot to indicate that slot's charging status, which is another big miss. The past Energizer kits from Costco came with better "slow" chargers (e.g. 300/150 mA to charge AA/AAA) with individual leds for each slot.

I'm wondering about the 2300 mAh AA batteries in the kit though. Made in Japan batteries implies rebadged Eneloops. But I'm not aware that there have ever been 2300 mAh Eneloop batteries being marketed. At first, I thought the Energizer AA batteries may be rebadged Eneloop Pro batteries. But Eneloop Pro AAs are rated at 2550 mAh as far as I know. Maybe they really are rebadged Eneloop Pro, but were binned out because they couldn't reach the 2550 mAh spec. Does anyone have personal experience with 2300 mAh Made in Japan Energizer batteries?

bcm00re

Dec 9, 2021

1,563 Posts

Joined Dec 2008

Dec 9, 2021

bcm00re

Dec 9, 2021

1,563 Posts

Quote from arm&hammer

:

Yes, I bought both the Eneloop and the Energizer rechargeable batteries about 5 years ago to use in Xbox controllers. The Enelops still work and all the Energizers seem to die quickly and some dead.
I know that is not a great comparison and some may argue that was batteries 5 years ago, things have changed, depends on how you used them, etc...but that is my limited observation. Any others want to weigh in?

Are those Energizers made in Japan or China? Energizer was using China for awhile -- I think around 5 years ago -- until they learned their lesson. Smilie

Mystikalrush

Dec 9, 2021

531 Posts

Joined Sep 2018

Dec 9, 2021

Mystikalrush

Dec 9, 2021

531 Posts

Can only be found in person physically in store in the battery aisle, grab fast, don't look back, you wont regret this deal.

MMMilk

Dec 9, 2021

3,744 Posts

Joined Sep 2008

Dec 9, 2021

MMMilk

Dec 9, 2021

3,744 Posts

Quote from budster

:

I'm wondering about the 2300 mAh AA batteries in the kit though. Made in Japan batteries implies rebadged Eneloops. But I'm not aware that there have ever been 2300 mAh Eneloop batteries being marketed. At first, I thought the Energizer AA batteries may be rebadged Eneloop Pro batteries. But Eneloop Pro AAs are rated at 2550 mAh as far as I know. Maybe they really are rebadged Eneloop Pro, but were binned out because they couldn't reach the 2550 mAh spec. Does anyone have personal experience with 2300 mAh Made in Japan Energizer batteries?

Binning could explain the differences, but my guess is that it was an attempt to not dilute eneloops marketing. Panasonic seems to be playing with the capacity numbers, listing max.("up to") numbers in their marketing instead of min. capacities. Energizer I suspect is doing the same with these Costco batteries, but it appears the 2300mAh may be a minimum capacity.

I am testing one of the Costco Energizers right now, just to see their capacity from new. My test indicates the AA's are 2450mAh capacity, AAA's are 900mAh. They were at ~55% capacity in package which indicates they were either not precharged, or possible manufactured a few years ago.

Laddas
AA 2450mAh
AA 1900mAh
AAA750mAh

Energizers(Costco 2021)
AA 2300mAh
AAA 800mAh

Eneloops
AA 1900mAh
AAA 750mAh

Eneloop Pro(*Varies depending on region)
AA 2450mAh
AAA 900mAh

Eneloop Lite
AA 950mAH
AAA 550mAH

Last edited by MMMilk December 14, 2021 at 03:40 AM.

mw2slick

Dec 11, 2021

179 Posts

Joined Apr 2012

Dec 11, 2021

mw2slick

Dec 11, 2021

179 Posts

Has anyone confirmed if these are low self discharge(LSD)?

MMMilk

Dec 12, 2021

3,744 Posts

Joined Sep 2008

Dec 12, 2021

MMMilk

Dec 12, 2021

3,744 Posts

Quote from mw2slick

:

Has anyone confirmed if these are low self discharge(LSD)?

I think they are LSD, mostly because they appear to be coming from a Japanese manufacture that only produces LSD cells. Since it appears they were not shipped precharged, only time will tell. If they only drop to 2100mAh after a year of storage I suppose that would be confirmation.

Last edited by MMMilk December 12, 2021 at 02:21 PM.

Energizer rechargeable batteries 1hr AA/AAA plus Charger @Costco (in-store) $13+tax

$13

$36

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