EEMB LIR2032 Rechargeable Battery Charger with 4PCS 3.7V Lithium-ion Coin Button Cell Batteries 45mAh for Car Remote Key Fob Watch

they do work well.

Really simple to use. Small charger about the size of a big plug with 2 slots at the top for batteries. The instructions were easy, you line up 2 button cell batteries to the correct poles of positive or negative, slide into the slot and charge. Once the plug is in, the lights go on. No light means you've inserted incorrectly. Red for charging and green for charged. Batteries can be removed with a bit of tugging and can be a bit slippery as the grip holding the batteries in place is strong. That's the only reason I'm giving 4 out of 5 stars as everything else is pretty reasonable. There should have been a release lever to remove the batteries rather than having to grapple with removing them. My fingers are not nibble and it would be difficult for people with dexterity or arthritis. I guess you can use a tweezer though. It's like trying to yank 10p pieces out of a mini vice/slot machine with only the tips visible once slotted into place. It's a little frustrating. I did buy a mini charger of one to compare which takes twice the time to charge so this is really good value.

Seems to be a good buy but only just got it so will need to asses over a longer period

I bought these because the title said "For key fob" but on purchasing and trying them they did not work. After first thinking my fob had lost synchronisation I eventually discovered that the non-rechargeable versions are 3V, not 3.7V as these are. So if your key Fob is tolerant of this the great but mine (ID.3, ID.5) are not so these are completely useless. I know it says 3.7V but did you know there was a difference between them?Going to return them.

Good product

The product is of great value, and the quality is excellent. As with all rechargeable batteries, they do get warm, so it is important to handle them with care and keep an eye on them. The size is compact and takes up minimal space on the desktop. It quickly pays for itself after a few uses.

I bought this as a backup for something I didn't eventually get, so haven't needed. The short of it is I haven't used charger that's why I only gave 4 stars.

Works well saves me buying random packs of battery’s will be good value over time over time.