What is the diameter? I want to know if I can fit in my Cervelo seatpost

It will definitely fit in your Cervelo seat post. I am using mine in my Aspero.

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SHIMANO Bt-Dn300 Battery Black, One Size | bike-shifters-and-parts

SHIMANO Bt-Dn300 Battery Black, One Size | bike-shifters-and-parts

Product ID: 441470536

Details

Battery Capacity
500 Milliamp
Battery Cell Composition
Lithium Ion
Brand
SHIMANO
Number of Batteries
1 Lithium Ion
Recommended Uses For Product
Bicycle

⚡500mAh long-lasting charge

🔋59g ultra-lightweight power

🚴‍♂️Seamless wireless Di2 integration

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Description

🔋 Power your ride with stealth and stamina—upgrade to the future of shifting!

PLUG PLAY PRECISION - Effortless seat tube installation with a sleek, low-profile design.
NEXT GEN WIRELESS SYNC - Optimized for Shimano’s 12-speed Di2 systems, ensuring flawless shifting.
RACE READY RELIABILITY - Consistent voltage output guarantees smooth, lightning-fast gear changes.
FEATHERLIGHT POWERHOUSE - At just 59g, this battery keeps your ride nimble without compromise.
ENDURANCE FOR EVERY RIDE - 500mAh capacity delivers extended runtimes—ride longer, charge less.

The SHIMANO BT-DN300 Battery is a lightweight, rechargeable lithium-ion power source designed exclusively for Shimano’s 12-speed Dura-Ace and Ultegra Di2 wireless shifting systems. Weighing only 59g and boasting a 500mAh capacity, it offers extended runtimes and consistent voltage for smooth, reliable gear changes across road, gravel, and cyclocross disciplines. Its compact seat tube installation and upgraded wiring make it a seamless, maintenance-free upgrade for serious cyclists seeking cutting-edge performance and durability.

Specifications

ASIN	B0B1KP6CCT
Antenna Location	Bicycle
Battery Capacity	500 Milliamp Hours
Battery Cell Type	Lithium Ion
Battery Weight	0.2 Pounds
Best Sellers Rank	#230,628 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #658 in Adult Electric Bicycles
Brand	SHIMANO
Built-In Media	Shifter Battery
Customer Reviews	4.8 4.8 out of 5 stars (32)
Item Dimensions	10 x 6 x 2 inches
Item Weight	3.2 ounces
Manufacturer	Shimano
Model Name	Di2 Battery
Model Number	Shimano
Number of Batteries	1 Lithium Ion batteries required. (included)
Reusability	Rechargeable
UPC	192790894720
Unit Count	1.0 Count
Voltage	12 Volts
Warranty Description	Limited Warranty

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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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HK$2226

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered 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 Hong Kong.

Secure transaction

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