High-capacity, safely protected power, ready to plug in.
This EVE 21700-50E Battery is a pre-assembled, protected power solution designed for DIY electronics and small devices. It utilizes a genuine EVE 21700-50E high-capacity cell, delivering a nominal 3.7V and a substantial 5000mAh capacity.
Unlike bare cells, this battery features a built-in side protection board (BMS) that safeguards against overcharge, over-discharge, over-current, and short circuits. To ensure maximum safety, the protection board limits the continuous working current to 4A (with a peak of 8A).
Pre-wired with a default XH2.54 2-pin connector (red/black leads, 8-15cm), it is ready to drop into your projects. Important: While the underlying cell is capable of higher currents, the protection board limits this pack to 4A. It is not intended for high-drain power tools or devices drawing over 4A.
Key Features
Genuine EVE 21700-50E Cell: Authentic high-capacity 21700 cell provides reliable 3.7V power and a massive 5000mAh capacity for longer runtime.
Built-in Protection Board (BMS): Comprehensive safety against overcharge, over-discharge, over-current, and short circuits.
Safe 4A Continuous Current: Designed for low-to-medium current devices. (Max continuous 4A, peak startup 8A).
Pre-wired & Plug-and-Play: Comes with a default XH2.54 2-pin connector (red/black leads, 8-15cm) for easy integration.
Compact Pack Size: Shrink-wrapped with the side protection board, measuring approx. 71mm length and 23.5mm diameter.
Parameters
*Dimensions are approximate and include the protection board and heat shrink wrap. Please allow ±1-2mm tolerance.
Applications
Recommended For:
DIY Electronics & Microcontrollers: Safe power for Arduino, ESP32, Raspberry Pi, and breadboard projects.
Portable Devices: Ideal for low-current devices like portable sensors, IoT nodes, and small wireless modules.
Custom Power Banks: Build your own safe, small-capacity power bank with protection already built-in.
Mini Fans & Small Gadgets: Suitable for devices drawing under 4A.
Flashlights (Low-Power): Suitable for standard LED flashlights that draw less than 4A.
Not Recommended For:
High-Drain Devices (>4A): Do not use in high-power flashlights, power tools, or devices drawing more than 4A continuously. The protection board will cut off power.
Vaping/Mechanical Mods: Not suitable for high-current vaping devices.
Devices Requiring Bare Cells: If your device's battery tray expects a standard flat-top cell without wires, this pack will not fit.
FAQ
Q1: What is the maximum discharge current of this battery?
A: Because it is equipped with a protection board, the continuous working current is limited to 4A (with a peak of 8A for short startups). It is not designed for high-drain devices.
Q2: The cell is rated for 10A, why is this pack limited to 4A?
A: The original EVE 21700-50E cell can handle higher discharge, but the added protection board is rated for a maximum continuous current of 4A to ensure safety and prevent overheating. Do not exceed this limit.
Q3: Does it have a protection board?
A: Yes, it has a built-in side protection board to prevent overcharge, over-discharge, over-current, and short circuits, ensuring safe operation.
Q4: What are the dimensions?
A: Because of the added protection board and heat shrink wrapping, the pack measures approximately 71mm in length and 23.5mm in diameter.
Q5: Can I change the connector to something else?
A: The default is an XH2.54 2-pin. We can potentially provide other connectors (like JST, PH2.0, or bare wires) upon request. Please contact us before ordering if you need a different connector.
