are these compatible with sony bravia KD55X8509C

Doubt it. These are infrared and newer Sony glasses are Bluetooth

Do anyone have any idea what is the deference between TDG BR 250 and TDG BR 250B?

I think it is only a newer model . These glasses go with 3D bravia tv's . That's my personal opinion . Have a look on www.sony.co.uk/accessories and I'm sure you will find the right answer . Type in the compatibility box your tv model and you'll find your answer. Hope this helps

How long do these glasses take to charge

Whilst starting up 3D glasses in low battery, working indicator is blue and blinks for 5 seconds. During charging working indicator is always red until charging is finished. From flat to full charge is about 2 hours.

Would you know if they are compatible with Samsung LED 3D TV's?

No they are not. Only with SONY 3D TV's!

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Description

👓 Elevate Your Viewing Game!

BUILT TO LAST - Lightweight yet durable, these glasses are perfect for marathon viewing sessions.
RECHARGE IN A FLASH - Get back to your favorite shows quickly with a rapid recharge via micro USB.
SEE IT ALL FROM ANYWHERE - Enjoy crystal-clear 3D images from any angle, ensuring no one misses the action.
STYLISH FUNCTIONAL DESIGN - Our wraparound design blocks out distractions, delivering a vibrant 3D experience.
EXPERIENCE 3 D LIKE NEVER BEFORE - Immerse yourself in stunning 3D visuals with Sony's cutting-edge Active Shutter technology.

The Sony TDG-BR250 3D Active Shutter Glasses are designed for an immersive 3D experience with BRAVIA 3D TVs. Featuring advanced Active Shutter technology, these glasses provide clear images from a wide viewing angle, quick recharge capabilities, and a stylish design that enhances your viewing pleasure while blocking out external light.