Can i leave the usb cable plugged in whilst using the battery? not charging and discharged at the same time, just need to have the ability keep usb in

While the battery charges charges using the USB there would be no problem, leaving the USB charger cord plugged in as there would be load on the charger or battery. You cannot overload the USB Charger when its not not under charge. They are designed that way when they are made.

Is ebl usb rechargeable 9v batteries - 5400mwh suitable for guitars?

I bought these for another purpose. Short version, I was using a 9v guitar battery box in another project. These batteries did not fit in the battery box

Is the size of ebl usb rechargeable 9v batteries standart or larger than usual ones?

The same size as the normal 9v battery.

Is it safe/possible to charge and discharge these at the same time? Can I leave them plugged into the device they're powering while I charge them up?

In the case of the USB chargeable batteries, yes it is. They continue to produce 9 volts on the main terminals and can deliver power to connected devices while being charged via the micro USB socket on the bottom. While charging the red LED lights up as normal.

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🔋 Power Up Your Life with EBL's Rechargeable Batteries!

VERSATILE USE - Perfect for high-demand devices like smoke alarms, toys, and medical equipment.
RAPID RECHARGE - Get back to full power in just 2 hours with advanced iQuick technology.
CHARGE ANYWHERE - USB charging design means you can power up on the go, no extra charger needed.
POWER THAT LASTS - Experience 5400mWh of long-lasting energy without memory effect.
ECO FRIENDLY CHOICE - Up to 500 deep charge cycles, reducing waste and saving you money.

The EBL USB Rechargeable 9V Batteries pack a punch with a 5400mWh capacity, offering long-lasting power and quick charging capabilities. With a unique USB charging design and the ability to support up to 500 charge cycles, these batteries are perfect for a variety of high-use devices, making them an eco-friendly and efficient choice for modern consumers.