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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EBL USB Rechargeable 9V Batteries - 5400mWh Long Lasting Batteries with Micro Charging Cable - Quick Charge in 2 Hours (Pack of 4)

Product ID: 217390224

Details

Battery capacity
5400 Milliamp
Battery cell composition
Lithium Ion
Brand
EBL
Number of batteries
4 9V batteries
Recommended uses for product
GPS

⚡2-hour quick charge

🔋5400mWh high capacity

🔌USB rechargeable convenience

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¥7854

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Stay charged, stay ahead — power up your life in record time!

RAPID RECHARGE - Advanced iQuick tech fully charges batteries in just 2 hours, so you’re never left waiting.
BUILT TO ENDURE - Up to 500 deep charge cycles ensure these batteries keep pace with your busy, tech-driven lifestyle.
POWER THAT LASTS - 5400mWh lithium-ion cells deliver steady 9V power with no memory effect, keeping your devices running longer.
VERSATILE PERFORMANCE - Perfect for smoke alarms, wireless mics, GPS, toys, and more—reliable power for all your essential devices.
UNIVERSAL USB CHARGING - Charge anywhere with the included 4-in-1 micro USB cable—ditch bulky chargers and stay effortlessly powered.

EBL USB Rechargeable 9V Batteries pack a powerful 5400mWh capacity with stable 9V output, rechargeable up to 500 times. Featuring fast 2-hour USB charging with a versatile 4-in-1 cable and built-in LED status indicators, these batteries combine convenience and longevity for high-demand devices like smoke alarms, microphones, and GPS units.

Specifications

ASIN	B089CRTDDY
Amperage	2 Amps
Antenna Location	GPS
Battery Capacity	5400 Milliamp Hours
Battery Cell Type	Lithium Ion
Battery Weight	120.8 Grams
Best Sellers Rank	1,453 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 50 in Rechargeable Household Batteries
Brand Name	EBL
Country of Origin	China
Customer Reviews	4.4 4.4 out of 5 stars (911)
Item Dimensions	45 x 26 x 17 millimetres
Item Weight	0.15 Kilograms
Manufacturer	EBL
Model Number	9VCV-USB
Number of Batteries	4 9V batteries required.
Reusability	Rechargeable
Unit Count	4.0 count
Voltage	9 Volts

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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¥7854

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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