HW Rechargeable D Cell Batteries, Lithium D Batteries with 2 in 1USB-C Cable Fast Charger, 2 Pack 7500mWh D Batteries, Over 1000 Cycles, Long Lasting Size D Batteries for Flashlight, Camping Light

Works well in my smoke detectors. It’s nice not to have to keep replacing batteries every couple of months. Longevity is very good doesn’t take too long to recharge great value for the money

Bought for my pin pointer while metal detecting and had them a year now with no trouble.

A nice rechargeable 9V battery but a little bigger than a regular 9V. Barely fit into my Harbor Freight multimeter.

I purchased a LAZYBOY power recliner. In case of power outage, which happened to me twice, my wife had to help me out due to recent surgeries with old recliner.You put 2 9v batteries in a box on power cord.Work slowly but does get you out, problem is batteries are done after that.After testing and recharging several times, these batteries are great!NOTE! the 2 battery box has a USB C connection for charging both a same time, plus light red when charging and green when charged!

Got this 9 volt today and plugged in the provided charging cable. LED turned red. I believe it is supposed to flash which it did not. 3 hours later and it still has not changed to blue or green like it's supposed to when it's fully charged. Listing says that it would charge in 1.5 hours. It's a waste of money. It'll cost me more on gas to return it than it did to buy the product.

Great 9 volt rechargeable battery for both light and heavy uses but when using it for speakers, ultrasonic anti-barking and pest control, and laser drivers either for low and high powered with burning capability for cutting or engraving as a power source then I would recommend to add 1 or 2 filter capacitors around 1uf to 47uf in between(or parallel) the input to filter the noise it generates in which noise or ripple voltage and current is very bad to sensitive electronic components such as LED's and laser diodes.

Holds a charge for a while, but it will suddenly just stop when charge runs out. My microphone has the battery indicator on the transmitter and receiver; it will show as fully charged for the entire duration but when charge runs out the power cuts with no indication.It also doesn't charge with a USB-C PD charger (the ones every phone and laptop come with) so you will need an old USB-A charger or a computer to charge.

I use these for HO scale model railroading and I was previously forgetting to turn the light off so if I leave the light on it's no big deal because there easy enough to recharge and it doesn't cost me $5 a piece for a store-bought 9 volt. Would buy again many times over!