What exactly makes these "high capacity"? Isn't 800 mAh standard?

Duracell and Energizer alkaline AAA batteries are 1150 and 1200 mAh respectively, so claiming 850 mAh is high capacity is deceptive.

what type of charger do you recommend?

XTAR. Check them out. Great chargers.

Have anyone measured the AAA High-Capacity ones? 800 mah is not high capacity so I wonder if Amazon's description is in error.

I ran a batch of four brand new Amazon Basics High-Capacity AAA batteries through four passes of Refresh/Analyze on a MAHA MH-C9000 charger with a 400ma charge / 200ma discharge rate. All cells exceeded the 800 mahr rating on the cells but one was below the advertised 850 mahr on the first cycle. All improved with additional cycles as has been reported by others. The final numbers were 893 mahr, 863 mahr, 852 mahr and 867 mahr.Normal capacity AAA low discharge nimh's are rated at 750 mahr. The 800 mahr rating is considered high capacity for a AAA cell. The highest capacity low discharge nimh AAA cell I can find is rated at 950 mahr but they cost a lot more than these cells. These Amazon Basics are good value for the money.

Can these be recharged using a standard "Energizer" NiMH battery charger?

I have had no problems with either the Duracell or Energizer battery chargers. As long as your charger is NiMH compatible you will not have any problems. Your charger should have a label which tells you what battery types it is compatible with.

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♻️ Power up sustainably, stay charged effortlessly!

POWER THAT LASTS - 850mAh capacity ensures your devices run longer without constant swaps.
READY WHEN YOU ARE - Pre-charged using solar energy—grab and go with zero wait time.
LONG TERM RELIABILITY - Retains 65% charge even after 3 years of storage, so you’re always prepared.
DEVICE FRIENDLY DESIGN - Optimized 1.2V NiMH chemistry fits most AAA devices with consistent performance.
ECO SMART RECHARGEABILITY - Recharge up to 500 times, slashing waste and your carbon footprint.

Amazon Basics 16-pack AAA NiMH rechargeable batteries deliver a robust 850mAh capacity with 1.2V output, pre-charged via solar energy for immediate use. Designed for longevity, they recharge up to 500 times and maintain 65% charge after 3 years in storage, making them an eco-conscious and reliable choice for everyday electronics.

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Item Dimensions	9 x 6 x 0.95 inches
Item Weight	0.25 Kilograms
Unit Count	16.0 Count
Battery Cell Type	NiMH
Recommended Uses For Product	Camera
Reusability	Rechargeable
Battery Capacity	850
Voltage	1.2 Volts

Amazon Basics 16-Pack Rechargeable AAA NiMH High-Capacity Batteries, 850 mAh, 1.2V, Recharge up to 500x Times, Pre-Charged

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