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 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 20–23 mm inner diameter seatposts and RL344 for 21–29 mm 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 20–23 mm inner diameter.
  RL344 fits round seatposts with 21–29 mm inner diameter.

• Lightweight and Compact
  Easy to install and suitable for professional bike shops or home mechanics.

Product Specifications

Product Options / Variants

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

Model: RL343
Material: Rubber
Suitable seatpost inner diameter: approx. 20–23 mm
Length: approx. 70 mm
Width: approx. 28 mm
Battery contact diameter: approx. 14.6–17 mm
Quantity: 1 pair / 2 pcs
Net weight: approx. 11.3 g
Package size: approx. 17 × 10 × 3 cm
Package weight: approx. 14 g

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

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

Model: RL344
Material: Rubber
Suitable seatpost inner diameter: approx. 21–29 mm
Length: approx. 70 mm
Width: approx. 32.5 mm
Battery contact diameter: approx. 14.6–17 mm
Quantity: 1 pair / 2 pcs
Net weight: approx. 13.8 g
Package size: approx. 17 × 10 × 4 cm
Package weight: approx. 16 g

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

Compatibility

Suitable for:

• Shimano Di2 internal battery systems
• 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:

Package Includes

Depending on the selected option:

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