They do not deliver what they promise. After 3-4 charges that lasted a short time, I bought a charger that shows how much they "fill up" and I realize that the capacity has dropped below the 10% they claim!
I do not recommend buying them.

They don't charge. So I put them to charge on a fast charger and they show EROR. While I have other old ones abandoned for 10 years and they charged immediately!!!! It's better to get souvlaki to keep the taste!

I have them from a Chinese store, luckily I didn't buy a pack of four and I didn't have to pay for shipping, so I only wasted about 5 euros. I have a Philips one from the 2000s with 2450mAh and it lasts, seriously, 20 times longer. Stay away, guys, better go for regular batteries...

-I had 2 sets.
-In no case can it fit a 4700 mAh AA battery, I knew that, but even if it had half of the mAh it claims, it would still be fine. But which half...
-Completely empty, measured with a Nitecore charger, they held from 550 to 600 mAh.
-Their lifespan is unacceptable (how can it be acceptable with 500 mAh).
-There is a strong memory effect.
-After 10 recharges, the 4 batteries show an error on the charger and do not charge.
-If you store them charged for a week, after 10 days they will be empty.
Conclusion? Throw them away and get reputable ones, where when they say 1500 mAh, it's actually 1500, and when they say 2000, it's actually 2000.
BAD CHOICE

I bought them last week.
I charged them carefully with a smart charger.
In a very light discharge (starting at 34mA, ending at 1mA), the capacity measured at 701mAh.
There are some other options available at the same price with a capacity of 700mAh.

I bought this product along with a pack (4 pieces) of the same brand AAA just before Christmas. Together with the shipping, they cost me about 11 euros. I STILL CRY MY MONEY.
First, it is definitely not 4700 mah, it should probably say 47.
Second, the 2 AAA batteries are off, they don't even charge.
UNFORTUNATELY, I HAD NOT READ THE ABOVE COMMENTS...

They don't do anything they promise.
The capacity is obviously fake. There are no 4700 batteries. Especially these ones are probably 470. Definitely not over 1000. The Memory phenomenon is real and as for maintaining the charge... it's a joke. In the first uses, they can deceive you somewhat. After a while, however, you realize how inadequate they are. You charge them for hours, and as soon as you go to use them, they last for a few seconds. The same thing happens when you have them charged and stored. You think you have batteries, but when you need them, you will always find them empty. I wouldn't buy them again.

The actual mAh is much less than half of the advertised 4700mAh!
+ They die very quickly!
I have Duracell rechargeable batteries bought over 7 years ago before the Songpus ones, and they still work better than these which are already dead!

There is no charger that charges it correctly and also in no case do they have 4700mAh. They drain faster than the old 2600mAh ones I always had in the same device. I put this battery in the wireless mouse and it doesn't last even half an hour, while with the old ones I could go for 2 days.