Power your custom projects with this Samsung 30Q 2S 18650 Battery Pack, assembled from two genuine Samsung INR18650-30Q high-drain cells in series. This pack delivers a nominal voltage of 7.2V (commonly referred to in the industry as 7.4V, with a full charge of 8.4V) and a robust 3000mAh capacity with a 15A continuous discharge capability. It is the ideal power source for DIY electronics, custom power banks, portable speakers, and light-to-medium power tools that require a 2S Li-ion configuration.
⚠️ CRITICAL SAFETY WARNING: This pack is built using unprotected (bare) Samsung 30Q cells. Because these cells do not have built-in protection circuits, you MUST use an external BMS (Battery Management System) for both charging and discharging. Never use this pack without proper over-charge, over-discharge, and short-circuit protection. Improper use can lead to fire or explosion.
Key Features
Genuine Samsung 30Q Cells: Built with two authentic 3000mAh high-drain cells for reliable performance and cycle life.
2S Configuration (7.2V Nominal / 8.4V Full Charge): Perfect for devices requiring a 2-cell series setup. (Note: 7.4V is the industry standard category name; the true nominal voltage of 2S Li-ion is 7.2V).
3000mAh Capacity: Retains the full capacity of a single cell in series configuration, providing ample runtime for portable devices.
15A Continuous Discharge: The 30Q is a balanced high-drain cell, capable of handling up to 15A continuous output.
Spot-Welded Construction: Assembled with pure nickel strips for low resistance and reliable connections (spot-welded, never soldered directly to the cells).
External BMS Required: Designed for advanced users and DIY builders who will install their own protection board.
Parameters
Applications
Recommended For:
DIY Electronics & Robotics: Ideal for Arduino, Raspberry Pi, and custom 2S projects requiring reliable power.
Portable Speakers & Audio Gear: High-capacity power for Bluetooth speakers and portable amps.
Custom Power Banks: Build your own high-capacity power bank (BMS and charging module required).
Light-to-Medium Power Tools: Suitable for tools designed for 2S operation that draw less than 15A.
Not Recommended For:
High-Power Devices (>15A): The 30Q is not a 20A+ cell. Do not use in high-drain applications like heavy-duty grinders.
Direct Use Without BMS: Never use or charge this pack without an external Battery Management System.
Standard 18650 Devices: This is a 2S pack (approx. 7.2V), not a single 3.6V cell. Using it in a single-cell device will damage the device.
FAQ
Q1: Is this pack 7.4V or 7.2V?
A: The true nominal voltage of a 2S Li-ion pack (3.6V x 2) is 7.2V. However, in the battery industry, it is commonly categorized as "7.4V" (based on an older 3.7V standard). It charges to 8.4V maximum. Both terms refer to the same 2-cell series configuration.
Q2: Does this battery pack have a built-in protection board (BMS)?
A: No. It is made from unprotected Samsung 30Q cells. You must use an external BMS for safe charging and discharging. Never short-circuit the pack.
Q3: How do I charge this pack?
A: You must use a charger designed for 2S Li-ion packs (8.4V output) combined with a proper BMS. Do not use a single-cell 4.2V charger.
Q4: Can I use this pack for my power tool?
A: It depends on the tool. If your tool accepts a 2S pack (7.2V/7.4V) and draws less than 15A, it will work (with a BMS installed). For heavy-duty tools requiring >15A, consider a higher-drain cell.
Q5: Can I solder wires directly to the pack?
A: Never solder directly to the battery cells. The heat will damage the cells. Use a spot welder with pure nickel strips, or use pre-welded packs with leads.
Q6: How should I store this pack?
A: Store at approximately 7.2V - 7.6V (roughly 40-50% charge) in a cool, dry place. Use non-conductive packaging to prevent short circuits.