Samsung 30Q 5S 18650 Battery Pack 18.5V (21.0V Full Charge) 3000mAh 15A High Drain – Unprotected DIY Pack for Power Tools & Projects (No BMS / No Wires)

Power your high-voltage DIY projects with this Samsung 30Q 5S 18650 Battery Pack. Assembled from five genuine Samsung INR18650-30Q high-drain cells in a 5S series configuration, this pack delivers a nominal voltage of 18.5V (with a full charge of 21.0V) and a robust 3000mAh capacity with a 15A continuous discharge capability. It is the ideal foundation for custom 18V/21V power tools, portable power stations, robotics, and high-output lighting systems requiring a 5S Li-ion setup.

 CRITICAL SAFETY WARNING: This is an UNPROTECTED, BARE CELL PACK.

1. No BMS Included: The image shows the "Total Positive" and "Total Negative" tabs only. You MUST install an external 5S BMS (rated for 21V) for safe charging and discharging. Never use this pack without over-charge, over-discharge, and short-circuit protection. A 5S pack can reach 21.0V, which is dangerous if mishandled.

2. No Wires Attached: This pack comes with spot-welded nickel strips only. You must solder your own wires or spot-weld your connections.

3. High Voltage Risk: 21V is significantly higher than standard 12V or 14.4V packs. Ensure your wiring, connectors, and charger are all rated for 21V. Improper handling can cause short circuit, fire, or explosion.

Key Features

Genuine Samsung 30Q Cells: Built with five authentic 3000mAh high-drain cells for reliable performance, low internal resistance, and long cycle life.

5S Series Configuration: 5-cell series layout, ideal for fitting into custom battery compartments for 18V/21V devices.

18.5V Nominal / 21.0V Full Charge: Standard 5S Li-ion voltage for compatible devices. (Note: 18.5V is the industry standard category name; the true nominal voltage of 5S Li-ion is 18.0V).

15A Continuous Discharge: The 30Q is a balanced high-drain cell capable of handling up to 15A continuous output.

Spot-Welded Nickel Strips: Assembled with pure nickel strips for low resistance. No wires or connectors are included.

Clear Polarity Markings: The pack clearly marks the "Total Positive" and "Total Negative" tabs for easy BMS installation.

Parameters

*Dimensions are estimated based on standard 18650 cell sizes in a linear 5-cell arrangement. Actual size may vary slightly (±1-2mm) due to nickel strip welding and heat shrink wrapping. Please allow tolerance for your battery compartment design.

Applications

Recommended For:

DIY Power Tool Battery Packs: Rebuild 18V/21V tools (drills, saws, grinders, etc.) that require a 5S pack. Must install a 5S BMS.

Portable Power Stations: Build your own 18.5V/21V backup power supply (requires BMS and charging module).

Robotics & RC Projects: Custom 5S battery packs for larger robots, RC cars, or drones.

High-Output Lighting Systems: Custom LED lighting requiring 5S voltage.

Not Recommended For:

Direct Use Without BMS: NEVER use or charge this pack without a proper 5S BMS. This is extremely dangerous.

Standard 12V or 14.4V Devices: This is an 18.5V/21.0V pack. Do not use in lower-voltage devices unless they explicitly support 5S Li-ion.

High-Power Devices (>15A): This pack is built with 15A cells. Do not use in high-drain tools requiring 20A+ continuous.

FAQ

Q1: Does this battery pack include a protection board (BMS)?

A: No. The image only shows the total positive and negative nickel tabs. This is an unprotected bare cell pack. You must purchase and install an external 5S BMS (rated for 21V) before use.

Q2: Does it come with wires?

A: No. The pack only includes spot-welded nickel strips. You will need to solder your own wires or spot-weld your own connectors.

Q3: How do I charge this 5S pack?

A: You must use a dedicated 5S Li-ion charger (21.0V output) combined with a proper 5S BMS. Do not use a single-cell 4.2V charger or a lower-voltage charger.

Q4: Is this pack safe to use?

A: It is safe only if you install a proper BMS and follow correct wiring procedures. 21V is a high voltage. Lithium-ion packs can be dangerous if short-circuited or over-discharged. If you are not experienced with DIY battery pack assembly, we strongly advise buying a pre-assembled, protected pack instead.

Q5: Can I use this for my 18V/21V power tool?

A: Yes, many 18V/21V tools use 5S packs (18.5V nominal, 21.0V max). However, you must ensure the tool can handle the 21.0V full charge and you must install a BMS. Check your tool's specifications first.

Q6: What are the dimensions of this pack?

A: The estimated dimensions are approximately 92mm (width) x 65mm (height) x 18.4mm (depth) for a linear 5-cell arrangement. Please allow a tolerance of ±1-2mm.