Seller was paid for 4 batteries, but I only got 3 working batteries. How can I reach their customer service?

Well. I got 2 but none of them works. Please let me know if you find out. Amazon should get rid of this seller.

How long does the charge hold while not in use?

Lithium-Ion has a very high retention at mid-charge. Generally it loses around 5-10% charge in the first 72 hours until it hits 90%, then around 2-3% per month. Once it drops under 20%, it will begin to die out rapidly within around 2 weeks.

Are these batteries supposed to reach temps of over 140+ degrees when charging? I'm afraid they're going to catch fire.

No, that is too hot. About 120 is as hot as they should get. You should be protected against a fire like the seller pointed out although it’s not a safety valve it’s a fuse that will break but can’t be reset. But if the battery is getting that hot in the first place it make me question the quality and worry that the fuse won’t work. The seller is completely wrong about it being impossible for the battery to catch fire, it’s rare but definitely possible. Also fire aside getting that hot is going to severely shorten the battery’s lifespan.

What is the weight in grams of a single aaa battery?

Not sure but light them 1.2v recharge and regular 1.5v battery

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S**E

I can’t believe I’ve been using my batteries for over 4 years on a regular basis in a fan. They take a little longer to charge now. These would probably be equivalent to an EV with 200,000 miles on it.

21.09.2025

J**S

The batteries are very pricey. I replaced some Duracell batteries with them. Where the former lasted 3 months, these lasted 3 weeks before having to recharge, which is not great.

4.11.2023

J**E

Work great. Easy to charge

31.10.2025

R**R

I have been looking for a suitable replacement for the D Cell batteries that my equipment needs. I've tried various brands of the large capacity NiMh batteries and none worked properly. Immediately upon installing freshly charged NiMh batteries, my device would show the batteries where at half capacity (as detected by the equipment). After 45 minutes to an hour it would start to tell me it was time to turn off due to battery depletion. So I decided to give the 1.5 Volt D Cell Lithium rechargeables a try. I was a bit dubious but what the heck. I ordered 2 sets of the D1 batteries (a total of 4 batteries, my device requires 3). I gave them an initial charge and plopped them in. Well, much to my surprise, after 5 hours the device was still showing a full charge. I had never gotten this even with brand new high quality Alkalines. I turned off the equipment and waited a couple of minutes to see if the device would go through a cold start because it draws a bit more current from a turned off condition. No problem, it started right up showing a full charge. At this point I ordered a couple more sets so I would have a back up. The only thing left to see is how fast these will self discharge. Since the battery is always in an active state it has to draw at least a small amount of current, so I don't expect them to have the same shelf life of a regular style battery. Anyway, I just wanted to say that I am very happy with these batteries. Hopefully I with get many cycles out of them.

27.04.2021

T**.

It's light weight, there isn't much metal material in them. Don't let the numbers fool you. It act like AA battery.

17.01.2026

ASIN	B08C7S5JVM
Best Sellers Rank	#116,156 in Electronics ( See Top 100 in Electronics ) #869 in Rechargeable Household Batteries
Item model number	D
Manufacturer	LANKOO

USB D Lithium ion Rechargeable Battery, High Capacity 1.5V 12000mWh Rechargeable D Battery, 4 H Fast Charge, 1200 Cycle with Type C Port Cable, Constant Output,2-Pack

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