Why are these batteries stated as 2400mah when its 800mah? So which is it? I'm confused if you look at the description at the very top

It is indeed a puzzlement why Amazon has not corrected the "IN THE BOX: 4-pack of AAA high-capacity rechargeable batteries (2400mAh)" in the text. That's clearly an error. The photo of an individual battery does clearly show "850 mAh". Anyone who knows much of anything about NiMH batteries knows that no 2400 mAh AAA exists, or at least I certainly don't know of any. I see that these same batteries in AA are 2400, and that's probably the source of the error. I wouldn't call if fraud or bait and switch, it's an error that's needed correction for some time.

are these made in china or japan?

China, per the box and the battery itself.

How long do these batteries last on a single charge?

These are 850 ma/h so take the power your device uses and divide into 850. So if you’re drawing 425 milliamperes it will last two hours.

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Amazon Basics 4-Pack Rechargeable AAA NiMH High-Capacity Batteries, 850 mAh, Pre-Charged

Product ID: 181891129

Details

Battery Capacity
850
Battery Cell Composition
NiMH
Brand
Amazon Basics
Number of Batteries
4 AAA
Recommended Uses For Product
Camera

⏳70% charge retention at 6 months

🔋850mAh High Capacity

♻️Rechargeable 100s of times

Description

🔋 Power up smarter, recharge greener, and never run out when it counts.

POWER THAT LASTS - 850mAh capacity fuels your devices longer, so you stay unplugged and unstoppable.
CONSISTENT PERFORMANCE - Avoid mixing batteries to maintain peak power and extend lifespan—engineered for reliability.
LOW SELF DISCHARGE TECH - Keeps 70% charge after 6 months—perfect for emergency kits or rarely used gadgets.
ECO SMART RECHARGEABILITY - Pre-charged and ready to go, these batteries recharge hundreds of times, saving you money and the planet.
FRUSTRATION FREE PACKAGING - Arrives ready to use with zero hassle, because your time is too valuable to waste.

Amazon Basics 4-Pack AAA NiMH rechargeable batteries deliver 850mAh high capacity with low self-discharge technology, maintaining 70% charge after 6 months. Pre-charged and ready to use, these eco-friendly batteries can be recharged hundreds of times, packaged in certified frustration-free materials for easy storage and immediate use.

Specifications

ASIN	B081FFKT59
Antenna Location	Camera
Battery Capacity	850 milliampere_hour
Battery Cell Type	NiMH
Best Sellers Rank	#8,992 in Our Brands ( See Top 100 in Our Brands ) #771 in AAA Batteries
Brand	Amazon Basics
Customer Reviews	4.6 4.6 out of 5 stars (6,920)
Global Trade Identification Number	00840095832434
Item Dimensions	4.13 x 0.43 x 3.74 inches
Item Weight	11.93 g
Manufacturer	Amazon Basics. This product may originate from China or Malaysia
Model Name	Rechargeable batteries
Model Number	85AAAHC
Number of Batteries	4 AAA batteries required.
Reusability	Rechargeable
UPC	840095888745 840095832434
Unit Count	4 Count
Voltage	1.2 volts

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