Home Page

Product Catalogue

Tips and FAQs

About Us

View Your Cart

Terms and Conditions



Contact Us


Small Battery Company logo

Seiko 3027-4MZ (Panasonic MT616 with special connector) for 4M21

Type: Battery / Capacitor. Voltage: 1.5 V. 

Diameter: 6.8 mm. Height: 1.6 mm.

Price: 14.75 each. 14.50 each if you buy two or more.

Also known as: Seiko 3027-4MZ, Panasonic MT616 with connector and includes a bracket/clamp and insulators.

These Seiko 3027-4MZ devices were originally not batteries at all, but miniature capacitors. More recently however, Seiko has upgraded their specification and replaced them with minute rechargeable batteries.

This is a genuine SEIKO KINETIC MOVEMENT capacitor / battery for use in Seiko Kinetic watches.

Consisting of a Panasonic MT 616 with special connector plates, this Seiko part 3027-4MZ is a replacement capacitor for the following Seiko watch movement calibres:

Seiko 4M21, 

The calibre is typically inscribed on the back of your watch. For example a watch might have........


inscribed on the back. The calibre, 4M21, is highlighted.

These 3027-4MZ MT616 with tag are almost exclusively used in Seiko Kenetic electronic watches.

This 3027-4MZ MT616 with tag is the newer enhanced performance longer duration type and comes with Mylar insulator and  metal clamp. If you are replacing the original version based on a SL621 cell you will need this product in order to replace your clamp. If you already have the enhanced performance MT616 version you can discard the clamp.

The Panasonic MT616 is a button-type titanium carbon lithium rechargeable Li-ion battery that uses lithium titanium oxide as the positive material, carbon as the negative material, and organic electrolyte.

If you don't find the movement calibre you are looking for, contact us by email. Use the 'Contact Us' link in the left hand frame.

© The Small Battery Company 1999 - . All Rights Reserved.