Ms621 Battery

Updated October 6, 2026

Overview

Product sourcing insights & recommendations

27 来源

The MS621 (specifically the MS621FE model) is a highly specialized Manganese Silicon (MS) lithium-ion rechargeable coin battery produced primarily by Seiko Instruments Inc. (SII). Sii Alldatasheet

Product Overview & Key Specs

The battery is designed for long-term reliability in miniature electronic systems. Blikai Key technical highlights include:

Performance: 3.0V nominal voltage with a 5.5 mAh capacity. Sii Scribd
Durability: Capable of 1,000 cycles at 20% Depth of Discharge (DOD). Allparts
Size: Extremely compact at 6.8 mm x 2.1 mm, weighing just 0.23g. Tme Sii
Operational Range: Standard operating temperatures range from -20°C to +60°C, though "T" variants can reach -40°C to +85°C. Cool-Pi Trustedparts

Market Trends & Industry Insights (2024–2026)

The market for these micro-batteries is evolving with the following key drivers:

IoT & Wearable Growth: The surge in smart devices and medical wearables is maintaining a steady demand for high-reliability memory backup (RTC/CMOS) power. Maximizemarketresearch
Miniaturization: As electronic components shrink, the MS621 remains a "Gold Standard" for high energy density in small form factors. Allparts
B2B Sourcing: Direct wholesale pricing typically ranges between $0.40 and $0.60 per unit for bulk orders (MOQ 20–100 pieces).

Competitive Landscape

While Seiko is the primary manufacturer, the distribution and secondary manufacturing of compatible cells are concentrated in China's tech hubs:

Key Suppliers: Companies like Shenzhen Ljcell Co., Ltd. and Dongguan Misen Power Technology are major B2B distributors providing both genuine and high-quality compatible options.
Production: Manufacturers increasingly focus on ISO-certified production lines to meet the strict quality requirements for medical and industrial applications.

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Sources & References

27 sources cited · Verified industry data & reports

MS621FE | Seiko Instruments Inc. Micro Energy Division

セイコーインスツル株式会社

Type, MS621FE. Nominal Voltage(V), 3. Charge Voltage (Standard Charge Voltage)(V), 2.8 to 3.3(3.1). Nominal Capacity(mAh), 5.5. Internal Impedance(Ω), 80.

Get to Know the MS621FE

Blikai

MS621FE Specifications ; Battery Cell Size, Coin, 6.8mm ; Voltage - Rated, 3 V ; Capacity, 5.5mAh ; Size / Dimension, 0.27" Dia x 0.08" H (6.8mm x ...

Micro Battery - 2017

Cool Pi

“MS621T” They offers wider temperature range from -40°C to 85°C. APPLICATIONS Backup power for Real Time Clock, or memory. Type Nominal Voltage (V) IC card, ...

MS621FE Lithium Battery Specifications | PDF

Scribd

Key specifications include a nominal voltage of 3.0V, operational temperature range of -20°C to 60°C, and various performance characteristics.

Micro Batteries - AllParts

allparts.co.kr

TS621 FEATURES • Large discharge capacity: TS obtains 15 times larger capacity to same size ca- pacitor. Realizes more than 1000 charge/discharge cycles at 20% ...

Seiko Instruments MS621FE

TrustedParts.com

Product Specifications ; Battery Size: MS621 ; Capacity: 5.5 mAh ; Height: 2.1 mm ; Maximum Operating Temperature: + 60 C ; Minimum Operating Temperature: - 20 C.