EEMB Lithium Polymer Battery 3.7V 820mAh 653042 Lipo Rechargeable Battery Pack with Wire JST Connector for Speaker and Wireless Device- Confirm Device & Connector Polarity Before Purchase

This battery does well! I did have a project of intalling battery to a bluetooth divice which didn't have a internl battery, so I inproviced this battery in conjuction with a module to recharge it and it worked perfectly, now my device doesn't need to be connected to electrcity all the time I just change the battery and I'm done for atleast 6 hours of operación wirelessly. Pretty good!

So far I'm very pleased with this battery. The four stars is only because I've only charged and discharged it twice so far. I ran a capacity test at the rated current and voltage and measured almost exactly the claimed mAHr. Excellent!

Used to replace the battery in an old golf gps monitoring device (GameGolf golf shot tracker). My GameGolf device was out of warranty and technically was not user serviceable so I took it apart and soldered in this replacement for about one tenth the cost of the device. I figured what the heck as the device was essentially bricked without a battery that could be recharged. This item did the trick and fit in, and I actually have more mAh available than the original. Can’t comment on battery life nor longevity of the battery itself at this time as I have only used my repaired device two times but it seems to be holding its charge and the charge indicator on my device seems to indicate that I am getting increased time per use (as expected with more mAh capacity) than the original LiPo. Will have to see what happens with repeated recharge cycles as to the battery’s longevity.

The terminal on my bone stimulator was too small for this battery. I was hoping it to be compatible but was not. The manufacturer of the health product didn’t want to send me a replacement battery bec it was from 2018. Though they wouldn’t send you one if it was a 2022 in 2023. They want to make their money n those things cost $1200 and up.

This got my old Bluetooth speaker working again! Good quality larger capacity and smaller than the original!

The batteries I purchased are listed as 820mah but they are actually 82mah, woefully insufficient for my needs. Needs to have an accurate description.

Works to power my project but wasn’t sufficient for booting. Otherwise good product for smaller projects with lower current draw.

It's pool season, and my bride loves tunes while splashing & sunning. She's used a little "JBL Clip" to amp up her phone tunes - but it started operating on shorter and shorter time frames (around 1/2 hrs). When new, it would run for 4 hrs plus. With this in mind, I figure that original battery was past it's "best by" date.Ordered this battery (rec'd quickly) as replacement, and dug in. Took out original 550 ml amp unit, and spliced in this new one. Before buttoning things back up, I put and charger- and sure enough the little puppy volted up to 4.19 vdc b4 completing charge (charging @ 5 vdc thru it's micro USB input).Handed reassembled back to my bride to resume her sun & fun. She's used it many times since over the last month - BUT ONLY GETS AROUND 3 HRS runtime (naturally, keeping out of direct sun). While for the most part, the original problem is resolved - BUT, I would think with the replacement being of higher ml amp's - I would think the runtime would be even longer than factory new. With this in mind, I question the actual storage capacity of this replacement. Without having some kinda tiny shunt available for further testing - the jury is still out.If the supplier wants contact me to discuss further - I'd welcome their input. Don't know if I got a mediocre specimen or what - but don't think battery has capacity of stated specs...