LankooUSB 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

Q: 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.

Q: 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.

Q: 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.

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

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

4.2/5

Product ID: 542862675

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Details

Number of batteries
2 D batteries
Brand
Lankoo
Battery cell composition
Lithium Ion
Battery capacity
12000 Hour
Recommended uses for product
Laptop Phone

⚡4-Hour Fast Type-C Recharge

🔄1200 Recharge Cycles Durable

🔋12000mWh High Capacity

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Description

🔌 Power Up Smarter, Charge Faster, Live Greener!

POWER THAT LASTS - 12000mWh capacity fuels your devices longer, from flashlights to toys.
FAST FUTURE READY - Type-C USB charging means a full battery in just 4 hours—no more waiting around.
ECO WALLET FRIENDLY - Recharge up to 1200 times, cutting waste and saving you money over disposables.
CERTIFIED SAFE SOUND - CE, FCC, and RoHS certifications ensure your devices and safety are top priority.
SMART CHARGING INSIGHT - LED indicators keep you in the know—red blinking while charging, steady when full.

This 2-pack of USB Type-C rechargeable lithium-ion D batteries offers a robust 12000mWh capacity with rapid 4-hour charging and an impressive 1200 recharge cycle lifespan. Featuring LED charge indicators and certified safety compliance, these batteries deliver reliable, eco-conscious power for a wide range of devices.