USB Rechargeable Lithium D Cell Batteries - 4 Pack D Li-ion Battery with 2 USB-C 2-in-1 Charging Cable, 1.5V 10000mWh, Quick Charges 2 Hours, Over 1000+ Cycles

I have made multiple purchases of these batteries. Overall, I have found them to be the best on Amazon, especially considering the price.My second purchase of this 8-pack had at least 4 duds. By duds, I mean they didn't charge properly. They never got to full voltage. They also started to swell after the first "full" charge. It happens, I guess. It took me a few emails to make my case but in the end, the seller replaced them with batteries that worked just fine. So basically, I'd say to make sure you contact the seller with any problems.Also, these are not 10,000 mAh batteries. I have tested them a number of times and I get somewhere between 8,800-9,400 mAh. For me that's not a bid deal because they *far* exceed the capacity of other "10,000 mAh batteries" sold here.So, two dings, and still 5 stars? YES! In spite of the problems, they work great and I trust them. Good products overall, and backed up my the seller. Really, that's all you can ask for.

These rechargeable RayHom D cells have proven to me to hold a charge longer and provide more actual mAh capacity than three other brands..I did a six month test to check for voltage discharge and mah capability...I used four batteries of each brand and ran them through three charge/discharge cycles before testing...Along with the RayHom's I tested the Tenergy white, Bonai, and EBL...All were rated at 10,000 mAh...I charged them all up to 1.40 volts, but after a day they all had settled in at 1.36-1.37 volts...After six months the RayHom's averaged 1.32 volts, the Tenergy 1.28, the Bonai 1.27 and the EBL 1.22...The mAh capabilities were the same pecking order...The RayHom's averaged 9510 mah, Tenergy 9105, Bonal 8830, and the EBL 8040..I have some Tenergy's that are six years old with around 100 cycles and 70 percent of them still pass at 100 percent with the with the ZTS (MBT-1) tester...I hope the RayHom's hold up as well after six years as the initial results are sure encouraging...kd

I ordered 8 D cells. They arrived uncharged. I charged them overnight, green lights showing on all batteries; put them in a flashlight and the light beam was so weak as to be unusable. Disappointed. Will never buy Rayhom batteries again.6 Jan 2019: I have used these batteries daily for the last 2.5 weeks and in fairness to RayHom my initial review must be changed. Today I am recharging the batteries...for the first time since the initial charge. The batteries did arrive uncharged, but they did charge without any problem...and while the D cells don't light up my flashlight very well, they do power the LED light in the shower just fine and they have been used every morning for 2.5 weeks. This morning the output started to drop so today I put them in the charger. We'll see what happens.20 February 2019: I have recharged these D cells several times and they do continue to give good power. My initial review: "Weak battery," was too hasty. I have not used the AA's as much but, I have put a meter on them after 8 weeks and they still have an excellent voltage remaining. I would not hesitate to buy these again.

After our first daughter was born, I learned much of your life becomes battery powered for the next 6-12 months. Some things , like swings, bouncy seats, etc., are crucial. If it is 2 AM and your infant is melting down, you want to make sure the swing batteries have enough charge to get you through to the next feeding. I've been really impressed with these batteries (10k MAH). I have some 5k MAH rechargeable D cells which are fine, but the 10k MAH ones are just great. They last (shocker) much longer. And I purchased 8, so I always have 4 charged and ready to swap out if needed. Yes, they are more expensive, but at 2 AM with a screaming child (daughter #2), I'm happy I paid the extra money.

These are great quality rechargeable batteries! The price is very competitive, and I'm completely satisfied. I purchased 8x D-Cells to power a boom-box. I got so tired of buying alkaline D-cells (not cheap), and these rechargeable batteries have already paid for themselves after just a few uses. The seem to last just as long as the alkaline batteries did, so I don't doubt the 10,000 mAh claim. The voltage of each individual cell is very consistent across the set of 8 during use and in storage, none of them are noticeably weaker than the others. I highly recommend these if you're looking to kick your alkaline battery habit.

I charged all 8 of my batteries fully on the first day I received them. After using 4 of them for a week heavily they finally died (was expected). When I went to put in the other 4, they had already completely discharged! They were fully charged a week earlier! So I recharged all 8 and let them all sit for a week in their plastic cases, and low and behold they had all self discharged within 1 week. Total waste of $$. After contacting customer service, they verified that they were defective but offered me a PARTIAL refund. Somehow this company thinks it's ok to charge for defective items but won't replace them. LOOK ELSEWHERE! Hopefully Amazon customer service will be more help since my return window has closed. Stay clear unless you like throwing money away!

Very expensive for them all not to work. 1st or 2nd recharge and some do not re-charge. Why are we all trying re-chargeable for a 1-2 time use?Update: Batteries were replaced - I appreciate the quick customer services and company's standards to make it right. Thank you very much.