Would this work for other brand headlamps that take AAA batteries?

It didn't fit my Petzl Tactikka + RBG Headlamp purchased in 2017.

How many mah does this have? does it store more power than 3 regular aaa batteries?

It's going to be about the same as 3 regular (duracell coppertop) AAA batteries. 1250mAH@3.6V vs 1.2Wh @100mA for the regular batteries. It's a little complicated as one person answered because the voltage drop depends on both the current draw and time. It's not linear for either battery type. Note that the PETZL rechargeable weights the same as 2 regular AAA's, not 3, so there's an advantage there.

What size charger is correct for this battery? My 5v samsung charger has been almost 2 hours i do not want to damage it.

That should be no problem, especially if the battery is very low. It just uses an Android charger like yours and can sometimes take 4 or 5 hours to charge fully.

Is this compatible with petzl - tikka headlamp, 200 lumens ?

If it says it can take the petzl core, but I'm not entirely sure

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Description

🔋 Power your next adventure sustainably and smartly!

POWER THAT LASTS - 1250mAh Lithium-Ion battery fuels your adventures longer without the hassle of constant replacements.
HYBRID FLEXIBILITY - Compatible with multiple Petzl headlamps and AAA batteries for ultimate versatility.
PLUG PLAY CHARGING - Integrated USB port means effortless recharging anywhere—ditch disposable batteries for good.
CHARGE STATUS AT A GLANCE - Built-in LED indicator keeps you informed—red while charging, green when fully powered.
ADVENTURE READY IN ANY CLIMATE - Engineered to perform reliably even in low temperatures, so your gear never lets you down.

The PETZL ACCU CORE is a 1250mAh Lithium-Ion rechargeable battery designed for Petzl's HYBRID CONCEPT headlamps. Featuring USB charging and a charge indicator, it offers a sustainable, versatile, and cold-resistant power solution that fits seamlessly into your active lifestyle.

Specifications

Special Feature	Rechargeable
Colour	Standard
Power Source	Battery Powered
Light Source Type	LED
Included Components	Bike Parts
Voltage	1.5 Volts
Battery Cell Composition	Lithium Ion
Item Weight	23 Grams
Number of Batteries	3 AAA batteries required.
Brand	Petzl
Battery Description	Lithium-Ion
Style	headlamp
Mounting Type	Head Mount
Global Trade Identification Number	03342540815612
Manufacturer	Petzl
Size	One Size
UPC	602573116388
Model	E99ACA
Model Name	E99ACA
Model Year	2017
Product Dimensions	1 x 1 x 1 cm; 23 g
Batteries	3 AAA batteries required.
Item model number	E99ACA
Compatible Devices	Headlamp
Special Features	Rechargeable
Number of items	1
Batteries Included	No
Batteries Required	Yes
Battery Capacity	1250 Milliamp Hours
Battery Power Rating	4500 Milliamp Hours
Does it contain liquid?	No
Includes Rechargeable Battery	Yes
Item Weight	23 g

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