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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🔋 Level up your Gameboy SP power game—never miss a winning moment!

TAILORED FOR GBA SP - Perfectly compatible with Nintendo Gameboy Advance SP for seamless performance.
ECO FRIENDLY RECHARGE - Rechargeable design saves money and reduces waste—game smarter, greener.
POWER UP YOUR PLAYTIME - 850mAh capacity ensures up to 12 hours of uninterrupted gaming.
PLUG PLAY CONVENIENCE - Comes with a mini screwdriver for hassle-free installation—get back to gaming fast.
CONSISTENT VOLTAGE CONSISTENT WINS - 3.7V lithium-ion polymer battery delivers reliable, steady power.

The OSTENT 850mAh rechargeable lithium-ion polymer battery pack is designed specifically for the Nintendo Gameboy Advance SP, delivering a stable 3.7V output and up to 12 hours of gameplay. It includes a mini screwdriver for easy installation, offering a cost-effective and eco-friendly power solution that keeps your classic handheld ready for action.

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NT$5904

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Brand	OSTENT
Manufacturer	OSTENT
Model	024400
Product Dimensions	5.2 x 3.1 x 0.5 cm; 18 g
Batteries	1 Lithium Ion batteries required.
Item model number	024400
Hardware Platform	Game Boy Advance
Compatible Devices	Controller
Voltage	3.7 Volts
Power Source	battery powered
Battery Description	lithium-ion
Battery Average Life	12 Hours
Batteries Included	No
Batteries Required	No
Battery Capacity	850 Milliamp Hours
Battery cell composition	Lithium Ion
Battery Power Rating	850 Milliamp Hours
Does it contain liquid?	No
Manufacturer	OSTENT
Item Weight	18 g

OSTENT 850mAh Lithium Ion Li-ion Polymer Rechargeable Battery Pack Tool Kit for Nintendo Gameboy Advance SP GBA SP

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