4 Pack- Shockli AA 3.2V LiFePo4 650mAh Battery, AA 3.2V Solar Rechargeable Batteries - Ideal for Solar Garden Light

charge time was less than 6 hours.

So, I probably would not have written a review of these batteries, until a recent event. I ordered a the four pack of AA 3.2V LiFePo4 650mAh Battery on December 1, 2021 for $15.99, for a string of solar Christmas lights. I only needed one. So, the remaining three have been sitting around since then. Earlier this month, I got a solar address sign. I set it up a few days ago. After a full day of full sun, I found that the light was out when I checked it at about 8:30 PM. The light calls for a 14500 600mAh 3.2V battery. I found where I stashed the remaining three of these batteries. At 9:00 pm, Nov 8, I placed it in the battery compartment of the address light. The light turned on with no problem. Surprisingly, when I checked it the next morning, it was still on. According to the security camera, it went off about 7:43 AM, when enough daylight turned it off. NOTE: After I changed the battery, I set it up so the sign to face the house, because I didn't want to keep getting up to check it. The attached photo is from the security camera about 6:52 AM, just to show it was still on. The light seemed to be just as bright as it was when I installed it the night before. That same day, according to the security camera, after a very cloudy day, along with the first snow fall, the light was on for only about three hours. To be honest, I am wondering if the solar panels are not working. But, after almost four years of storage, I am surprised it had that much power left. So, I am impressed. If someone needs that size battery, I have no problem recommending these.

TLDR - MAKE SURE YOU GET THE GREEN BOX AND NOT THE PLASTIC CASE UPDATE ON PREVIOUS REVIEW: After posting my original people a nice rep from Shockli reached out to find out what had gone wrong. Since I had mentioned that my batteries arrived in a reusable plastic case, she asked for photos of the product I had received and noted that it was packaging they had not used in over two years. The new packaging is a green card paper box as seen in the attached photo. I reordered the batteries from Amazon, got the green box, and all 4 of the batteries worked: Let there be light! (in our front yard, at least) Thanks to Shockli for reaching out and for their apparent determination to offer good products and satisfy consumers: Thanks Linda! Previous Review: All Four Batteries Were Dead on Arrival - Batteries were well packaged - individually wrapped and in a reusable plastic case. Installed the first one - no joy. Tried it on different lights - No Go. Same thing for the remaining three. Tested them all with a multimeter and got readings of 0.0 and 0.1 - All. Dead. One of them was even faded and had small hard bumps under the wrap. Returned for refund - hesitant to re-order to see if this was aberration, but seems these 3.2volt LiFePo batteries are hard to find and the other reviews seemed positive...

Way cheaper then buying in my town and these work just as good

Bought these to use in a "4xAA" battery case for an amateur radio handheld transceiver to increase the voltage from the AA 6 volts nominal to the LiFePO4 12.8 volts nominal, allowing for a doubling of transmit power over AAs on the particular radio being used. Granted, the 650 mAh is not much at all for a high drain device, but this would be sufficient for short transmissions and conversations. Unfortunately, the radio was left on accidentally to the point it started cutting off, so I popped the battery pack out and placed the cells on the charger. I found that one of the four would no longer even accept a charge. I don't know how a solar light (for which these are advertised) would *not* discharge fully overnight during use, but if they do run until the battery is dead, they'll cause similar damage. ------- I do realize these are not marketed for ham radio use, and I'm not an idiot, I do know the low mAh rating wouldn't be much. I was, however, more concerned with voltage than capacity; I could have easily bought Lithium ion cells, but with the 4.2 volts they have when fully charged, I would need to use only three cells with a dummy fourth cell to keep voltage below 15 (radio's only rated for 12, so 13.8 is no worry, but much over 14.5 is risky). With LiFePO4's 3.2 volts, I would have all four cells and only be at 12.8 volts, which is well within the radio's capability to handle. The radio eats through alkalines like nobody's business, so I wanted rechargeables, but if I'm using rechargeables, I want something better than the general use NiMH cells. ----- With the one cell no longer taking a charge, I now have to use the dummy cell anyway, and only see 3x3.2 or 9.6 volts nominal and at only 650 mAh capacity. For that, I may as well use Li Ions anyway, get the 4.2x3 or 12.6 volts, and see anywhere from 1500 to 2200 mAh (because we all know the advertised "2800" and "3000" mAh on those cells is exaggerated, with current technology limits being what they are).

I rarely award items 5 stars - it typically requires near perfection. These batteries have earned 5 stars. I bought them to replace the battery in one of my new solar lights that wasn't lasting as long as the others - now it's the one that lasts the longest by far. This battery went from 5 pm to at least 3 am at full brightness that I witnessed - that's an astounding 10 hours. It probably lasted until dawn. These are 650 mAh and replaced 600 mAh batteries. I didn't think the extra 50 mAh would make much difference, but apparently it does. I'm so impressed, I'm buying more to go ahead and swap out the rest, even though their current batteries are new. Well done Shockli.

I'm completely re-writing my review. I had previously given a 1 star review saying that the capacity wasn't a fraction of what they claimed. After some thought, I realized that they perhaps didn't ship the batteries with a full charge. I believe this is the case, and then putting them in solar lights 'dead' in a Minnesota winter gave it no chance to charge up the batteries to capacity. To test this theory, I bought a special charger that does 3.2v batteries. It also allows you to test the capacity. As expected, the batteries were dead, but after charging and running a test -- showed that they had 608 mAh capacity (one battery test), which I think is acceptable (they are never right on with the specs, and still far better than the 300 mAh batteries that came with my solar lights). I put them in the solar lights and they were bright all night long. Any issues I have beyond this point is going to be on the solar lights, and not the battery since their capacities are good and holding a charge. So the only recommendation I have for people is to get a 3.2v charger and charge them up when you get them, as they may be shipped dead. [this is typical of some manufacturers to ship them dead for safety] My apologies to the seller for initially posting a crap review when my understanding of the product was wrong. I *WILL* be buying again!

Excellent replacement of original.