Does this work for Ultegra or is the Ultegra battery different than the Di2?

The battery is the same for the Ultegra Di2, external battery.

Will this battery charge via a 5-port junction box?

If I understand your question correctly, yes. If you are using a power strip, it should work fine.

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Shimano Batería Externa-SM-BTR1

Product ID: 4772166

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Details

Number of Batteries
1 Lithium
Brand
SHIMANO
Battery Cell Composition
Alkaline
Battery Capacity
1000
Recommended Uses For Product
Bicycle

⚡Lightweight 0.13 kg power boost

📏Compact 10x3x3 cm size

🚴‍♂️Optimized for Shimano Di2 cycling

Description

⚡ Power your ride, own the trail!

UPGRADE YOUR RIDE - Stay powered and connected, never miss a shift
FEATHERLIGHT DESIGN - Carry extra juice without feeling the weight
SLEEK COMPACT POWER - Fits seamlessly on your bike frame without bulk
DURABLE SHIMANO QUALITY - Built to endure your toughest rides and longest adventures
PRECISION ENGINEERED FOR DI 2 - Perfectly compatible with Shimano’s electronic shifting system

The SHIMANOBatería Externa-SM-BTR1 is a compact, lightweight external battery designed specifically for Shimano Di2 electronic shifting systems. Measuring just 10 x 3 x 3 cm and weighing 0.13 kg, it offers reliable power on the go, ensuring seamless performance for cycling enthusiasts who demand precision and durability.

Specifications

Item Package Dimensions L x W x H	5.47 x 3.27 x 1.5 inches
Package Weight	0.19 Kilograms
Item Dimensions LxWxH	3.94 x 1.18 x 1.18 inches
Item Weight	0.13 Kilograms
Brand Name	SHIMANO
Model Name	Di2
Suggested Users	Cycling
Manufacturer	Shimano
Part Number	ISMBTR1A
Model Year	2017

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