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 Charge

🔄1200 Recharge Cycles

🔋5000mWh High Capacity

S$49

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Power up smarter, faster, greener — never run out when it counts!

SMART LED STATUS - Red LED indicators keep you in the know—blink while charging, steady when ready.
ECO CHIC COST SAVVY - Replace thousands of disposables with 1200 reliable recharge cycles—save money and the planet.
UNIVERSAL COMPATIBILITY - Perfect for toys, flashlights, cameras, clocks, and more—power your life seamlessly.
POWER THAT LASTS LASTS - 5000mWh capacity fuels your devices longer, so you stay unplugged and unstoppable.
CHARGE AT LIGHTNING SPEED - USB-C fast charging gets you back to full power in just 2.5 hours—no bulky chargers needed.

Lankoo’s USB-C rechargeable lithium-ion C batteries deliver a constant 1.5V output with a robust 5000mWh capacity. Featuring ultra-fast 2.5-hour Type-C charging and an impressive 1200 recharge cycle lifespan, these batteries combine convenience with sustainability. Equipped with LED charge indicators and certified safety standards (CE, FCC, RoHS), they’re designed for versatile use in household devices, reducing waste and saving you money.

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
Battery capacity	5000 Milliampere Hour (mAh)
Battery cell composition	Lithium Ion
Best Sellers Rank	45,634 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 959 in Rechargeable Household Batteries
Brand	Lankoo
Brand Name	Lankoo
Customer Reviews	3.7 out of 5 stars 9 Reviews
Item Weight	0.11 Kilograms
Manufacturer	LANKOO
Model Number	C
Number of Batteries	2 C batteries required. (included)
Number of batteries	2 C batteries required. (included)
Recommended uses for product	Bicycle, Camera, Clock, Laptop, Phone, Radio
Reusability	Rechargeable
UPC	604697242387
Voltage	1.5 Volts

Reviews

M**N

Generally good - but build quality not 100%

I have had mixed success with these batteries. One of the ones I received has a fault with the USB C charging port meaning the battery couldn’t be charged. The others were all good. Unfortunately, it was over a month after having ordered it that actually needed to charge the battery - so outside the Amazon 30 day return window.

15.07.2026

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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