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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USB C Lithium ion Rechargeable Battery, High Capacity 1.5V 5000mWh Rechargeable C Battery, 2.5 H Fast Charge, 1200 Cycle with Type C Port Cable, Constant Output,2-Pack

USB C Lithium ion Rechargeable Battery, High Capacity 1.5V 5000mWh Rechargeable C Battery, 2.5 H Fast Charge, 1200 Cycle with Type C Port Cable, Constant Output,2-Pack

Product ID: 506287039

Details

Battery capacity
5000 Hour
Battery cell composition
Lithium Ion
Brand
Lankoo
Number of batteries
2 C batteries
Recommended uses for product
Bicycle Camera

⚡2.5H Fast USB-C Recharge

🔄1200 Recharge Cycles

🔋5000mWh High Capacity

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€ 50.55

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Power Up Smarter, Not Harder!

SMART LED STATUS - Intuitive red LED indicators keep you in the know—charging or ready, no guesswork needed.
POWER THAT LASTS LASTS - 5000mWh capacity fuels your devices longer, so you stay powered through every meeting and adventure.
CHARGE AT LIGHTNING SPEED - USB-C fast charging gets you back to full power in just 2.5 hours—because your time is money.
DUAL CHARGING CONVENIENCE - Included Type-C cable lets you charge two batteries simultaneously—efficiency meets modern multitasking.
ECO FRIENDLY COST SAVVY - Say goodbye to disposable batteries and hello to 1200 recharge cycles that save your wallet and the planet.

This 2-pack of USB-C rechargeable lithium-ion C batteries delivers a constant 1.5V output with a robust 5000mWh capacity. Featuring ultra-fast 2.5-hour charging via USB-C and a long lifespan of up to 1200 recharge cycles, these batteries combine convenience, eco-consciousness, and reliable power for a wide range of household devices. Certified safe with CE, FCC, and RoHS compliance, they come with a dual Type-C cable for simultaneous charging, making them the smart upgrade for professionals who demand efficiency and sustainability.

Specifications

ASIN	B08C7RXWJ9
Amperage	1.5 Amps
Antenna Location	Bicycle, Camera, Clock, Laptop, Phone, Radio
Battery Capacity	5000 Milliampere Hour (mAh)
Battery Cell Type	Lithium Ion
Best Sellers Rank	22,434 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 539 in Rechargeable Household Batteries
Brand Name	Lankoo
Customer Reviews	3.8 3.8 out of 5 stars (7)
Item Weight	0.11 Kilograms
Manufacturer	LANKOO
Model Number	C
Number of Batteries	2 C batteries required. (included)
Reusability	Rechargeable
UPC	604697242387
Voltage	1.5 Volts

Reviews

J**A

Great service

All excellent! Thank you

10.03.2026

D**D

Aye, it's alright

Weird pluging into the side of the battery hut its a good idea.

8.12.2022

C**Y

Poorly made potential fire risk, one of four didn't work, returned

Very poor design. The USB C socket feels very difficult to mate properly. One of four purchased didn't flash at all, I would not rely on this and even go as far as saying given the poor connector design they may be a fire risk. I have returned to Amazon.

23.10.2022

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