XTAR AA 1.5V Battery 4150mWh (4pcs 1.5V AA 4150mWh)

I'm excited by not having to buy single use lithium batteries again. These have higher power per charge than even the most expensive ones. I got tired of spending on that. Key: these batteries have a green indicator light when going dead. I use them for work and will no longer have to be surprised by them going dead. I bought 12 batteries. For my usage, that seems ro be enough power for 56,000 hours. If I were to get 4000 hours out of these I would be completely thrilled.

tested on outperform Eneloop Pro 2450mah outperform 3600mWh Lithium rechargeable AA estimate very close to alkaline AA capacity or slightly more but with steady 1.5v 90% of the time. not sure hold charge time (not tested)

Worms great for my Blink Outdoor 4 cameras. They provide the 1.5 V to power the cameras, and great MAH capacity

I already sampled and tested the 3300mWh version of this battery and I was hoping this one would be much improved. However, I was becoming skeptical when I measured 20 grams for each battery. It's hard to increase the energy by 25% without adding some bulk. Averaging the data over four tested cells, I measured a total of 3150mWh (I measured 2900mWh for the 3300 version). Keep in mind that 3150mWh is split between the time spent putting out 1.5V and 1.1 volts. If your application needs the full 1.5V, the energy during this phase is 2700mWh and 1795mAh. If you can make use of the energy while at 1.1V, the output is 3150mWh and 2200mAh. For comparison, a high-end NiMH battery is rated at 2400mAh which is 2880mWh at 1.2 volts. These measurements were all made at a drain of 200mA and I accounted for any voltage drop in the test wiring. The internal regulator circuit presents a continuous load of 15uA which implies a battery will lose about 20% per year (the Lithium cell has a capacity of about 750mAh). The regulator operates at about 90% efficiency and is highly integrated. It's amazing so much has been crammed into such a small volume. You'll have to decide if it makes sense for your application and what the price difference is between the 4150 and 3300 cells. One other difference: the 3300 cell doesn't have the built-in charging LED.

Does not work in my Schlage smartlock tray. The positive side nipple is smaller than a standard alkaline battery and does not engage the contacts correctly in the Schlage lock (why I bought them). Really not sure why the positive nipple is undersized, but note that for your application. If it is because of the LED light, I would recommend to remove that in order to make the battery a standard size as that is a much more important "feature" in my opinion. A smart design, but it doesn't work for my application so I had to return it.