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popularDesertGardener | Staff posted Today 05:28 PM
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popularDesertGardener | Staff posted Today 05:28 PM

4-Pack HW Rechargeable AA Lithium Batteries 2800mWh w/ Micro USB Cable $6.99 + Free Shipping w/ Prime

$6.99

$13

46% off
Amazon
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TIGER HEAD HI WATT BATTERY HK CO LTD via Amazon [amazon.com] has 4-Pack HW Rechargeable AA Lithium Batteries 2800mWh w/ Micro USB Cable (Yellow) on sale for $9.99 - $3 off with code 5CXXH2NE applied at checkout = $6.99. Shipping is free w/ Prime or $35+ orders.
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TIGER HEAD HI WATT BATTERY HK CO LTD via Amazon [amazon.com] has 4-Pack HW Rechargeable AA Lithium Batteries 2800mWh w/ Micro USB Cable (Yellow) on sale for $9.99 - $3 off with code 5CXXH2NE applied at checkout = $6.99. Shipping is free w/ Prime or $35+ orders.

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Today 05:57 PM
407 Posts
Joined Mar 2016
harley48Today 05:57 PM
407 Posts

Our community has rated this post as helpful. If you agree, why not thank harley48

Certainly inexpensive for 1.5v Li AA rechargeable. Know what you.....might....be getting.
I DO NOT have experience with these particular cells. But I DO have and tested:
HW 1.5v AA 3500mWh/2333mAh - Mine are the NON-USB charging. USB charging provides some convenience to some people BUT, at the expense of some capacity. It's a challenge to put all the components in the small 'can'. USB charging extracts this penalty.

The capacity of this in real testing at 0.5A - mAh current for 4 cells is:
- 1880-81%; 1870-80%; 1870-80%; 1764-76%
So the probable capacity of these is: 2800mWh/1.5v = 1897mAh x >0.80 (% capacity of the previous cells) = ~1500mAh. This could be worse due to the USB charging penalty.

I do not know is this cell line provides step down voltage. The 3500mWh cells do. This is what I found:
When ~480mAh remains they drop from 1.5v > 1.1v. This allows some notificatio that the cell needs charging.
The down side is MUCH longer time spent at 1.1v, at the expense of less time spent at 1.5v. So the 3500mWh cells have a 1.5v working capacity of ~1400mAh.
4
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Today 06:06 PM
93 Posts
Joined Apr 2016
flatcardToday 06:06 PM
93 Posts
Do they explode?
1
1
1
Today 06:14 PM
1,162 Posts
Joined Mar 2023
BigBGToday 06:14 PM
1,162 Posts
Learn what a buck converter is and then you will understand.

But it won't, because it can't.
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Today 06:56 PM
41 Posts
Joined Aug 2023
FaithfulGame3171Today 06:56 PM
41 Posts
Quote from flatcard :
Do they explode?
It can only good happen
1
Today 06:58 PM
953 Posts
Joined Apr 2013
TalysdaddyToday 06:58 PM
953 Posts
Reviews say they work with Blink cams, exactly why I need them. Thx Op!
Pro
Today 07:21 PM
1,607 Posts
Joined Jun 2018
ScoobieSnax
Pro
Today 07:21 PM
1,607 Posts
Spend an extra $2.50 and get an 8 pack with usb c charger. Likely the same real world capacity as these.

https://slickdeals.net/f/18736096
Today 07:33 PM
806 Posts
Joined Feb 2006
scoobysteveToday 07:33 PM
806 Posts
Micro USB? Are we back in 2007?
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Today 08:29 PM
1,040 Posts
Joined Jan 2007
Oneill5491Today 08:29 PM
1,040 Posts
Quote from harley48 :
So the 3500mWh cells have a 1.5v working capacity of ~1400mAh.
Correct me if I'm wrong, but that sounds like it would be less than an alkaline AA battery
Today 08:43 PM
93 Posts
Joined Feb 2019
FaithfulCorn509Today 08:43 PM
93 Posts
Quote from Oneill5491 :
Correct me if I'm wrong, but that sounds like it would be less than an alkaline AA battery
Most rechargeables haves lower capacity than alkaline. There are a few things going on, though. One is usable capacity depends on current discharge rate, higher discharge rate tends to lead to less usable capacity for alkaline than say Nimh. Also, there's voltage drop, alkaline starts at 1.5v and goes down to 0.9ish over the course of being discharged, so if your device needs more voltage to work, it'll die while the alkaline still has plenty of " life" left. Nimh will quickly go to 1.2v and stay there, lithium which are stepped down to 1.5v by internal circuitry will stay close to 1.5 until dead. That said, these particular cells seem pretty anemic.
Today 08:55 PM
94 Posts
Joined Feb 2019
FaithfulCorn509Today 08:55 PM
94 Posts
Quote from FaithfulCorn509 :
Most rechargeables haves lower capacity than alkaline. There are a few things going on, though. One is usable capacity depends on current discharge rate, higher discharge rate tends to lead to less usable capacity for alkaline than say Nimh. Also, there's voltage drop, alkaline starts at 1.5v and goes down to 0.9ish over the course of being discharged, so if your device needs more voltage to work, it'll die while the alkaline still has plenty of " life" left. Nimh will quickly go to 1.2v and stay there, lithium which are stepped down to 1.5v by internal circuitry will stay close to 1.5 until dead. That said, these particular cells seem pretty anemic.
Also, afaik there's no "eneloop" of lithium aa/aaa cells, they're all from manufacturers of varying track records who may overstate capacity and cut corners on safety. Also, the technology is in its infancy, so even cells from somewhat reputable brands like EBL tend to lose a ton of capacity after a few tens of use cycles (according to NYT wirecutter tests).

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