SINCEHOLY 2 Pack Rechargeable Lithium AA Batteries w/Charger, 1.5V 3600mWh Double A Batteries Long Lasting AA Li-ion Battery

These 1.5volt liion cells are great. They give you all of the advantages of an AA cell with very few of the detriments. They put out a real 1.5 volts compared to AA NiCd and NiMH which only put out 1.2 volts. Due to the design of these batteries, they will put out that 1.5 volts continuously until depleted. The NiCd, NiMH and standard primary all start off at one voltage and continuously give out less and less voltage until dead. These start at 1.5 volts and stay there until depleted. Some equipment wont even run on NiCd nor NiMH due to the 1.2 volts max, as they need a rewal 1.5 volts. Also, in comparison to a standard primary (non-rechargeable) AA battery, these Liion batteries will never leak so there's no worry about ruining expensive equipment. The only downside to these batteries is that they don't last as long as a real primary battery in extreme cold and heat. They will run out sooner in temp extremes. But, if/when they do, just pop in a fully charged battery and you are good to go. The only other downside to this relatively new technology is that these types of batteries all need their proprietary charger (at the moment). You cannot charge these in a regular NiCd, NiMH, nor LiIon battery charger, as the charger will not understand the technology at play. These are actually 3.7 volt lithium Ion batteries with a circuit board atop each one that brings the voltage down to a steady 1.5 volts. 99% of the chargers out there won't understand this, hence why they typically come with their own charger. Give it a few years and generic chargers will probably be able to handle this type of cell. I ordered the 2-pack and charger, and have a 4-pack on the way too.

My tests are complete. The performance of these batteries only looks bad when compared to the product details, not when compared to other batteries. Pros: They charge fast, in less than 3.5 hours. (I never timed these against the 2.5 hour claim, but I know it's less than 3.5) They deliver a constant voltage. Capacity is about the same as standard alkaline battery—but can be recharged. Cons: Not for use in devices that depend on low voltage to warn about low battery. They do not contain enough power to be labeled as 3600mWh. The tests: Constant Current capacity test (CC), Portable CD player and my contraption. CC, drain the battery to measure the capacity. My tester is calibrated to be reasonably accurate. 400mA, cutoff at 0.8V. SinceHoly 3600mWh was able to deliver 2279mAh or 3400mWh and drained in 05:42:18. Similar 3600mWh was able to deliver 2229mAh or 3312mWh and drained in 05:34:33. NiMH 2800mAh was able to deliver 2515mAh or 3096mWh and drained in 06:17:27. Looking at the results compared to the NiMH, these didn't last as long, but delivered more voltage in the run time, resulting in more mWh. Portable CD Player, made around the year 2006. Full volume, Repeat full CD. SinceHoly 3600mWh played for 44:39:42. Similar 3600mWh played for 44:32:13. NiMH 2800mAh played for 43:53:40. Standard Alkaline played for 44:39:30. There you have it. On this low power draw device they all come out similar. My contraption, basically a motor geared to a counter. Run until the motor stops. SinceHoly 3600mWh got 10044 and ran for 75:30:35. Similar 3600mWh got 10071 and ran for 74:25:12. NiMH 2800mAh got 10376 and ran for 93:59:18. Standard Alkaline got 11257 and ran for 106:24:16. These are able to make more turns in less time because of the constant voltage. The Standard alkaline got the most points, but also it was running below 0.8 volts for like 3 days. I will not test the recharge cycle amount claims. I'm sure it's many cycles. I have some graphs to try and show the way that the voltage acts compared to NiMH and alkaline in the CC test. The alkaline I used for the graph is not a top brand. Conclusion: These are really good batteries and well worth the cost. I was never able to get close enough to 3600mWh out of them, but not for lack of trying. I'm taking one star off because it would not have been hard for them to label/advertise these as 3400mWh. Feel free to ask for more comparisons and such in the questions.

I have been using NiMH rechargeable batteries for a long time and recently came across these. They caught my eye because I have a trimmer that came with a lithium battery in it and that thing has been working for years. I like the NiMH rechargeables but they take a long time to charge and seem to lose a bit of their charge over time even when not in use. This is a nice combination of a slim charger that can use any USB-C input along with two AA batteries. It seems to be built well and time will tell how long the batteries last. I've seen other reviews mentioning that they may not have the current to power high draw devices but I haven't tried that yet. Another issue I have seen mentioned in general is that lithium rechargeable systems may not work with rechargeable batteries from another manufacturer, but I have also not experienced this. At the time I purchase these I only saw the two-pack available, if I had the chance I would have picked the charger combo with more batteries. I may get more if these work as well as they seem like they will. They charged fairly quickly using my 45W fast charger so we will see.

These Sinceholy AA 1.5V Lith-ion batteries work great in my older 2015 Fenix LD22 flashlight. The included compact 2 cell charger uses USB C. They have a bit shorter run time than high quality alkaline, as most lith-ion AA's do. However, they do not dip their voltage and thus cause flashlight to dim, as Ni-MH batteries do. Be sure your device can support Lith-ion rechargeables, as many devices that have a built-in charge function are not designed to charge these, and would be very dangerous to try. Also, many devices rely on the voltage drop to base their battery level indicator on, so with these batteries, that gauge will always say full, until the device just shuts off. I just discovered that Lith rechargeable AA batteries seem to cause an issue in atomic clocks. I installed these as well as other brands into my 3 Atomic battery powered clocks. They no longer will receive the Atomic signal. I tried multiple locations, even setting one clock outside. The moment i switched back to my old Ni-MH batteries, they acquired the time signal inside nearly instantly.

The 2-Pack Rechargeable Lithium AA Batteries with Charger is super convenient and easy to use. Charging is simple with the included USB-C cable, and you can even power them up using a power bank while on the go—perfect for travel. They charge fairly quickly and hold power well. I’ve been using them in my Ring camera, and they’ve worked just fine. Definitely a money-saver compared to constantly buying disposable batteries. Compact and travel-friendly, this set is a practical choice worth trying out!

I have a smart door unlock which uses AA batteries. It says to use a certain branded battery, and when I tried using NiMH rechargeable batteries the door unlock did not work. I did a bit of digging and it turns out some higher powered devices actually need a more stable and higher voltage source to operate - which only Li-ion and certain brands of batteries can handle (and definitely not NiMH). Anyways, these batteries charged up great and are now working in my doorbell. The quality seems great and they're the correct AA size.

I really like these Lithium AA batteries AND they actually last a long time, and the charger works quickly. I tested them right away by charging them and used them in a flashlight and Nintendo switch Joycon, and they worked perfectly. They also charge in other chargers, but this one clearly seems stronger, so I prefer using it. One thing to note: the plastic case is actually the charger, which is different from most battery chargers I’ve used. It charges the batteries fairly quickly, but you’ll need a USB-C cable and charging brick to charge with it. That wasn’t an issue for me since I already had one, but it’s something to keep in mind. I’ve been using this brand of batteries for a while, and these batteries have been very reliable. They hold a charge well and work great in different devices. If you’re looking for a solid rechargeable option with a compact, efficient charger, this set is a great choice.

Review of B0DDXL434P - SINCEHOLY 2 Pack Rechargeable Lithium AA Batteries w_Charger, 1.5V 3600mWh: The first dry cells were zinc-carbon, then alkaline which were both 1.5v nominal. Then came rechargeables, NiCd, then NiMH, both 1.2v nominal. Most modern devices are designed to run on 1.2v, but older devices and some newer devices still expect 1.5v and don't run well, or at all, on 1.2v. So, enter these hybrid batteries with a Lithium-ion core. Lithium-ion has a nominal voltage of 3.7v so are not a direct replacement. These hybrid cells include a buck converter to drop the Li-ion voltage to a steady 1.5v, which is even better than alkaline because alkaline drops from 1.5v in a steady line, while these cells maintain a consistent 1.5v. But, when the Li-ion core is exhausted, the battery quits abruptly with little to no notice, so keep that in mind. Another thing to keep in mind is that these Li-ion batteries cannot be charged in a standard charger, they require the charger they come with. Includes a nice little compact charger. They charge more quickly than an equivalent NiMH battery. These batteries should solve the problem of devices not being happy with 1.2v of other rechargeables.