What are the exact product dimensions? mm are preferred.

The dimension of battery is 52x31x5mm .

I plugged battery in and charge light went out do I continue to leave plugged in?

If it's fully charged then it's fully charged. Try playing it until it red lights (low battery warning). If the time it takes to red light is way too short, somethings wrong. If the gameplay session lasts as long as it should (or longer), then all is well and the battery must've been shipped mostly charged already. If it didn't charge AND it doesn't turn on, make sure the gba sp battery tabs are clean and sticking out far enough to make proper contact with the battery (known issue with nintendo handhelds from sp forward). If it still doesn't charge AND won't turn on maybe you got a dud.

I am about to do some exhaustive testing of this battery, does anyone doubt the capacity?

Not really any doubt. Not sure why the testing. Works fine in my gameboy

Can I return this item?

That would be an Amazon policy question, but if brand new they have a fairly liberal policy.

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OSTENT 850mAh Rechargeable Lithium-ion Battery + Tool Kit Pack Compatible for Nintendo Game Boy Advanced GBA SP Console

Product ID: 438641481

Details

Battery capacity
850 Milliamp
Battery cell composition
Lithium Ion
Brand
OSTENT
Number of batteries
1 Lithium Ion
Recommended uses for product
Gaming Console

⚡3.7V stable voltage output

🔋850mAh high-capacity power

🛠️Includes mini screwdriver for easy install

Description

🔋 Power your childhood comeback with OSTENT’s ultimate GBA SP battery kit!

REVIVE RELIVE - Breathe new life into your classic console and never miss a winning moment again.
ECO FRIENDLY GAMING - Rechargeable design saves money and reduces waste, so you can game guilt-free.
PERFECT COMPATIBILITY - Specifically engineered for Nintendo Game Boy Advance SP to ensure a snug, reliable fit.
PLUG PLAY SIMPLICITY - Comes with a precision mini screwdriver for a hassle-free battery swap—no tech degree needed.
POWER UP YOUR NOSTALGIA - 850mAh rechargeable lithium-ion battery keeps your GBA SP gaming longer and stronger.

The OSTENT 850mAh Rechargeable Lithium-ion Battery + Tool Kit is a high-quality replacement battery designed exclusively for the Nintendo Game Boy Advance SP. Featuring a robust 3.7V output and an 850mAh capacity, it ensures extended playtime while the included mini screwdriver makes installation effortless. This eco-conscious rechargeable battery lets you revive your classic handheld console with reliable power and precision fit, perfect for millennials eager to relive their gaming roots.

Specifications

ASIN	B00FJ2WOJE
Antenna Location	Gaming Console
Battery Capacity	850 Milliamp Hours
Battery Cell Type	Lithium Ion
Best Sellers Rank	#14,930 in Videogames ( See Top 100 in Videogames ) #17 in Game Boy Advance Accessories
Brand	OSTENT
Compatible Phone Models	Nintendo Game Boy
Customer Reviews	4.5 4.5 out of 5 stars (779)
External Testing Certification	Não Aplicável
Item Dimensions	5.2 x 3.1 x 0.5 centimeters
Item Weight	0.02 Kilograms
Manufacturer	OSTENT
Model Number	AGS-003
Number of Batteries	1 Lithium Ion batteries required.
Reusability	Rechargeable
UPC	609652483287
Unit Count	1 Count
Voltage	3.7 Volts

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