Lithium Rechargeable D Batteries 4 Pack,7500mWh High Capacity 1.5V Li-ion D Batteries with 4 in 1 USB-C Charge Cable,Long Lasting D Cell Batteries(4Pcs)

These are a great value. I've recharged them hundreds of times already and they're still holding their charge like they were new

Purchased Feb 21, 2025, to use in LED flashlights. They work fine in the lights, in my C. Crane radio, in a motion-detecting security light, and others. So far, so good.Another Li-ion brand - Palogreen - did not work in any of three LED flashlights of different brands. In each, the Palos were very dim and the light flickered. They did work fine in the other items above.I was happy the Seyyen's worked in the LED lights. I was afraid perhaps Li-ion batteries, in general, might not like LED's for some reason.Only Con is the Seyyen "D's" are only 7500 mWh (5000mAh), whereas the Palos are supposedly 15,000mWh (10,000mAh).I have just ordered Camelcell "D1's" at 12,000mWh (8000mAh). They appear to be from the same factory as the Seyyens: Except for the capacity, the design style on the battery is the same. Hopefully they will also work in LED lights, with greater life between charges.

They work well but could hold a charge for longer

Great batteries & Easily charged

DO NOT BUY. Total junk. I purchased 12 of the Seyyen Lithium Rechargeable D Batteries to continually run some small “boxer style” fans. 4 traditional alkaline D cells (6 volts total) usually last 48 hours in this application. The Seyyen batteries were lasting only 12 +or- hours. Within the first week 3 had failed. 2 refused to take a 3rd charge and one had shorted out internally, with smoke and chemical jell coming out the USB charging port; blistering hot. These were taking 6 to 8 hours to recharge, using a high quality 200 watt power supply. A bit more expensive product from a different manufacture is working well, lasting 30 hours or so in this application and taking 3 ½ hours to recharge. I have totally lost faith in this product and did not want to fool around with these any more or get replacements from the manufacturer. These are unreliable and maybe unsafe. I sent them to the circular file and decided to eat the cost.

So upon arrival they were perfectly packaged and regardless of what anybody else thinks I kind of like the fact that these d size batteries are very lightweight. So with my own personal battery tester I tested these right out the box and they were charged I'm not sure how charged because mine's just only test whether if it's needs to be replaced or good but it was in the good zone leaning more towards the edge of the good zone to the right that being said that was a plus for me but I did put them on the charger with the c cable that it came with and they turned red like they mentioned and then within less than 2 hours they were solid green which was fantastic so that mean it had pretty much a close to full charge already when I had received them. What I'm looking forward to is testing them in a product that I have coming to me soon I can't disclose any details on what product it is but it is motorized and it takes six d size batteries. Funny thing this product that I had got that's on its way says to only use alkaline batteries I'm going to put that to the test by using these batteries. Now if the functionality of these batteries go well with the product that I have coming in past with flying colors in my book I will be coming back to re-rate these and keep them at a five-star rating but as of now five star rating just because of the condition they came in and how much charge they had when they came in which was good and let alone it only took me less than 2 hours to get fully charged with the c cable that being said hold tight until I actually get more information when I pop them in the product to be that has to use 6D batteries. Nothing at for the price of the 6D batteries totally beats buying d size alkaline batteries over the lifetime of the motorized item.

Good quality

Only stay charged for about a day, which in my house is only 6 hours and it took 3 hours to charge the batteries.