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 endlessly!

POWER THAT LASTS - 850 mAh capacity fuels your devices longer, keeping you ahead of the game.
LOW SELF DISCHARGE - Maintains 80% charge for 2 years, so your batteries are always ready to perform.
READY WHEN YOU ARE - Pre-charged and ready out of the box—no waiting, just go.
ECO SMART RECHARGEABILITY - Recharge up to 500 times and slash your carbon footprint effortlessly.
FRUSTRATION FREE PACKAGING - Easy to open and store, designed for your busy lifestyle.

Amazon Basics 4-Pack Rechargeable AAA NiMH Batteries deliver 850 mAh of reliable power at 1.2V, pre-charged and ready to use. Designed for both high- and low-drain devices, these batteries can be recharged up to 500 times with minimal power loss and maintain 80% capacity for up to 24 months, reducing waste and CO2 emissions.

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Item Dimensions	1.62 x 1.75 x 0.41 inches
Item Weight	1.76 ounces
Unit Count	4 Count
Battery Cell Type	NiMH
Recommended Uses For Product	Camera
Reusability	Rechargeable
Battery Capacity	850
Voltage	1.2 Volts

Amazon Basics 4-Pack Rechargeable AAA NiMH High-Capacity Batteries, 850 mAh, 1.2V, Recharge up to 500x Times, Pre-ChargedReducing CO2

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