Home > All Products > Brand > RISK > RISK RL343/RL344 Di2 Electronic Shifting Battery Holder Sleeve for Round Seatposts, Rubber Battery Mount Adapter for Shimano BT-DN300

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RISK RL343/RL344 Di2 Electronic Shifting Battery Holder Sleeve for Round Seatposts, Rubber Battery Mount Adapter

Name: RISK RL343/RL344 Di2 Electronic Shifting Battery Holder Sleeve for Round Seatposts, Rubber Battery Mount Adapter
Brand: DJC Bikes - DJC Components
Price: 11.09 USD
Availability: InStock

$11.09 ~~$15.40~~

-28%

RISK RL343/RL344 Di2 Electronic Shifting Battery Holder Sleeve for Round Seatposts, Rubber Battery Mount Adapter.

Do not force installation if the sleeve is too tight or does not match the seatpost.

for Shimano Di2 internal battery systems.

Options: RISK-RL343-For 20–23 mm Round Seatpost / 1 Pair; RISK-RL344-For 21–29 mm Round Seatpost / 1 Pair.

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Specifications
Warranty FAQ

RISK RL343/RL344 Di2 Electronic Shifting Battery Holder Sleeve for Round Seatposts, Rubber Battery Mount Adapter

The RISK RL343 / RL344 Electronic Shifting Battery Holder Sleeve is designed to securely hold internal electronic shifting batteries inside round bicycle seatposts. Made from flexible rubber material, it helps position the battery firmly inside the seatpost and reduces unwanted movement during riding.

This product is suitable for electronic shifting batteries such as for Shimano BT-DN300 and similar internal seatpost battery systems. The sleeve uses multiple damping ring structures to improve grip inside the seatpost, helping prevent loosening, sliding, or rattling.

Two size options are available to fit different round seatpost inner diameters: RL343 for 20–23mm inner diameter seatposts and RL344 for 21–29mm inner diameter seatposts. Each pack includes 1 pair / 2 pieces.

Key Features

Designed for Electronic Shifting Batteries
Helps secure internal electronic shifting batteries inside round bicycle seatposts.
Compatible with Shimano Di2 Battery Systems
Suitable for Shimano BT-DN300 and similar internal seatpost battery designs.
Rubber Construction
Flexible rubber material provides grip, damping, and stable battery positioning.
Multiple Damping Ring Design
Helps prevent loosening, sliding, vibration, and rattling inside the seatpost.
Limit Stop Design
Built-in positioning tabs make installation and removal easier.
Two Size Options
RL343 fits round seatposts with 20–23mm inner diameter.
RL344 fits round seatposts with 21–29mm inner diameter.
Lightweight and Compact
Easy to install and suitable for professional bike shops or home mechanics.

Product Specifications

Item	Model	Suitable Seatpost Inner Diameter	Material	Length	Main Width	Inner Battery Fit	Quantity	Net Weight	Package Size	Package Weight
Electronic Shifting Battery Holder Sleeve	RL343	20–23mm round seatpost	Rubber	70mm	28mm	approx. 14.6–17mm	1 pair / 2 pcs	approx. 11.3g	17 × 10 × 3 cm	approx. 14g
Electronic Shifting Battery Holder Sleeve	RL344	21–29mm round seatpost	Rubber	70mm	32.5mm	approx. 14.6–17mm	1 pair / 2 pcs	approx. 13.8g	17 × 10 × 4 cm	approx. 16g

Product Options / Variants

RL343 — Battery Holder Sleeve for 20–23mm Round Seatposts

Model: RL343

Material: Rubber

Suitable seatpost inner diameter: approx. 20–23mm

Length: approx. 70mm

Width: approx. 28mm

Battery contact diameter: approx. 14.6–17mm

Quantity: 1 pair / 2 pcs

Net weight: approx. 11.3g

Package size: approx. 17 × 10 × 3 cm

Package weight: approx. 14g

The RL343 is designed for smaller round seatposts with an inner diameter of approximately 20–23mm. It helps hold compatible electronic shifting batteries securely inside the seatpost.

RL344 — Battery Holder Sleeve for 21–29mm Round Seatposts

Model: RL344

Material: Rubber

Suitable seatpost inner diameter: approx. 21–29mm

Length: approx. 70mm

Width: approx. 32.5mm

Battery contact diameter: approx. 14.6–17mm

Quantity: 1 pair / 2 pcs

Net weight: approx. 13.8g

Package size: approx. 17 × 10 × 4 cm

Package weight: approx. 16g

The RL344 is designed for larger round seatposts with an inner diameter of approximately 21–29mm. It provides a secure and stable fit for compatible electronic shifting batteries.

Compatibility

Suitable for:

for Shimano Di2 internal battery systems
for Shimano BT-DN300 and similar batteries
Round seatposts with compatible inner diameter
Road bikes, gravel bikes, mountain bikes, and e-bikes using internal electronic shifting batteries

Please choose the correct model according to the inner diameter of your round seatpost:

Model	Recommended Seatpost Inner Diameter
RL343	20–23mm
RL344	21–29mm
Key Feature	Designed for Electronic Shifting Batteries Helps secure internal electronic shifting batteries inside round bicycle seatposts. Compatible with Shimano Di2 Battery Systems Suitable for Shimano BT-DN300 and similar internal seatpost battery designs.
Compatibility	Suitable for: for Shimano Di2 internal battery systems for Shimano BT-DN300 and similar batteries Round seatposts with compatible inner diameter Road bikes, gravel bikes, mountain bikes, and e-bikes using internal electronic shifting batteries

Package Includes

Depending on the selected option:

RL343: 1 pair / 2 pcs × battery holder sleeves for 20–23mm round seatposts
RL344: 1 pair / 2 pcs × battery holder sleeves for 21–29mm round seatposts

Note: Product images may show batteries, seatposts, frames, or other accessories for demonstration only. The package includes only the selected battery holder sleeve pair.

Important Notes

Please measure the inner diameter of your round seatpost before purchase.
Designed for round seatposts only.
Not recommended for non-round or irregular seatpost inner shapes unless compatibility is confirmed.
Make sure the battery and wiring have enough space inside the seatpost.
Do not force installation if the sleeve is too tight or does not match the seatpost.
Manual measurement may have slight tolerance.

Available Options

Each row below is one available option combination. Choose the complete combination that matches your setup.

Option 1
RISK-RL343-For 20–23mm Round Seatpost / 1 Pair
RISK-RL344-For 21–29mm Round Seatpost / 1 Pair

All Taxes & Duties Included • Fast Delivery (8–12 Days) • No Hidden Fees • 6-Month Warranty

1 How long is the warranty?
We offer 6 months limited warranty to all products because of the quality defects. We offer lifetime payable repair service after the warranty.

2 Do need to pay tax duty when package arrive my country?
You no need to pay tax when package arrive your country, most countries in the world no need pay.
USA aslo no need tax duty and tariff, our carrier will cover it.

Brazil, Chile, Columbia clients need pay import duty when package arrive your country.

3 Can I return the goods if I am not like it?
Yes you can apply return and refund when you receive the product within 7 days. But as return shipping fee is relatively high when send back to China, so we suggest you consider and carefully before purchase.

Or you can send message to us and discuss technical issues to clarify if the products is what you need, and then pay after you sure your order is correct.

4 How long is the shipping time?
To most countries 7-15days can arrive your address. Pay extra 20USD if want ship by Fedex DHL UPS.

5 How can I know the tracking number?
We will send the tracking code to your email automatically after we send the package. check the track update here https://www.17track.net/en

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