Seat-Tube & Rear-Rack E-Bike Batteries 2

Seat-Tube & Rear-Rack E-Bike Batteries 3

Seat-Tube & Rear-Rack E-Bike Batteries

Yizhan seat-tube (silverfish, Little Frog) and rear-rack (Dolphin) e-bike battery packs — 24V-52V, 5-20Ah, UL 2271 option, for city and classic frame layouts.

Brand: Yizhan
Nominal voltage: 24V–52V
Capacity range: 5–20Ah
Cell chemistry: Li-ion (18650 / 21700)
Application: Seat-tube and rear-rack packs for city and classic e-bike frames

Silverfish and Little Frog seat-tube cases plus Dolphin and flat rear-rack formats
Voltage options 24V-52V, capacities 5-20Ah
UL 2271 certified silverfish version (48V 20Ah) available
Customizable voltage, capacity, BMS and branding

Seat-tube and rear-rack packs cover the frame layouts downtube cases can’t: silverfish and Little Frog cases slot behind the seat tube on classic and folding frames, while Dolphin and flat rack packs mount over the rear wheel on city and cargo bikes — including fat-tire and mountain builds.

These are wholesale, quote-only products. Tell us your mounting style, voltage, capacity and certification requirements and we will confirm pricing and lead time.

Models & specifications

Model	Mount style	Voltage	Capacity	Notes	Certifications
Little Frog	Seat tube	36V / 48V	7.5–14Ah	Compact behind-seat-tube case	On request
Silverfish	Seat tube	36V / 48V	10–19.2Ah	Five capacity steps	On request
Silverfish (UL version)	Seat tube	36V / 48V / 52V	10–20Ah	BMS 15–30A	UL 2271 (48V 20Ah)
Rear rack	Rear rack	24V / 36V / 48V	5–20Ah	Flat rack-top case	On request
Dolphin	Rear rack	36V / 48V	10–17.5Ah	E-bike, fat-bike and MTB use	On request

Why this line

Covers classic, folding and rack-mount frame layouts beyond downtube packs
UL 2271 certified silverfish option for regulated markets
OEM service: voltage, capacity, BMS rating and branding customizable
Wholesale supply direct from the pack factory