What's the difference between AE-23 and A23?

As far as I can tell and I'm no expert, but there is no difference between the AE-23 12 volt battery and the A23 12 Volt battery. The popular brand companies use the A23 designator and off brand companies use the AE23 designator. Hope this helps

Nothing on the Amazon page or image says it's alkaline. Where does it indicate that it's alkaline?

if you llok close up on the battery its says alkaline on it. you may not see it in this picture, but if you look at other A 23 energizer picture you will see it.

what's the difference between the 23a and 27a batteries?

Google this " List_of_battery_sizes " (where I got answer). The A23 is 2/100 of longer" and 9/100" wider. So a 27a should fit where a 23a does fits in most cases, but not necessary the other way round. Both are 12V DC so no harm to a device if either battery fits and works in your device.

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Energizer Zero Mercury Alkaline Batteries A23 2 ea

Product ID: 316476927

Details

Battery cell composition
Alkaline
Brand
Energizer
Number of batteries
2 CR123A
Recommended uses for product
Camera Flash
Unit count
2 Count

⚡23 Amps peak amperage

🔋12V high voltage power

🛠️Alkaline tech for longevity

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Description

🔋 Energize your essentials with power that never quits!

COMPACT YET MIGHTY - Miniature size fits seamlessly into your essential devices, from remotes to monitors.
TRUSTED BY MILLIONS - 44,000+ glowing reviews prove Energizer’s unmatched reliability and quality.
PEAK PERFORMANCE AMPED UP - 23 Amps deliver consistent, high-energy bursts for instant device activation.
POWER THAT KEEPS YOU MOVING - Reliable 12V output fuels your keyless entry & gadgets without fail.
CUTTING EDGE ALKALINE CHEMISTRY - Advanced alkaline cells ensure longer life and fewer replacements.

Energizer Zero Mercury Alkaline A23 batteries provide a powerful 12V output with 23 Amps peak amperage, designed for small devices like keyless entry systems and glucose monitors. Featuring advanced alkaline technology, these compact batteries deliver long-lasting, reliable performance trusted by over 44,000 users worldwide.

Specifications

ASIN	B00004YK10
Amperage	23 Amps
Antenna Location	Camera Flash
Battery Cell Type	Alkaline
Best Sellers Rank	#91,121 in Electronics ( See Top 100 in Electronics ) #1,345 in Disposable Household Batteries
Brand	Energizer
Compatible Phone Models	from heart-rate monitors, keyless entry and glucose monitors, to toys & games.
Customer Reviews	4.8 4.8 out of 5 stars (44,021)
Global Trade Identification Number	00039800110091
Item Dimensions	8.6 x 4.6 x 1 centimeters
Item Weight	9 Grams
Manufacturer	Energizer Batteries
Model Number	A23BPZ-2
Number of Batteries	2 CR123A batteries required. (included)
Reusability	Rechargeable
UPC	039800110091
Unit Count	2 Count
Voltage	12 Volts

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