In the U.S. e-bike aftermarket, buyers often start with capacity when sourcing a replacement e-bike battery. However, Ah rating alone cannot confirm compatibility.

When selecting a Silverfish battery, buyers should also review motor application, voltage platform, BMS, battery dimensions and mounting requirements.

This battery configuration is designed for 250W–500W e-bike applications, including 250W e-bike battery replacement, 350W and 500W electric bike projects.

However, motor power is only an initial selection factor. Different controllers may have different current requirements.

The battery uses a 20A BMS, with customization available. Buyers should compare system requirements when evaluating battery compatibility.

This e-bike battery is available in:

• 36V 15.6Ah / 21Ah
• 48V 13Ah / 17.5Ah

The 36V version has a full-charge voltage of 42V, while the 48V version reaches 54.6V.

For Silverfish battery replacement, voltage matching should be checked together with the controller and charging system rather than selecting a battery based only on capacity or case appearance.

The specified size is 390 × 110 × 75 mm, providing an initial reference for a replacement e-bike battery project.

Buyers should also check:

• Mounting base and locking structure
• Output connector
• Charging connection
• Controller interface

A similar battery case does not automatically mean direct compatibility.

For U.S. repair businesses, distributors and B2B buyers, a practical selection process is:

For 250W–500W applications, Silverfish battery selection should move beyond capacity comparison and focus on matching electrical and installation requirements.