4S Battery Holder Case Box for 4X 18650 Li-Ion Batteries in Series (~15V)

📋 Overview

This plastic battery holder case holds four (4) 18650 lithium-ion batteries connected in series, providing approximately 14.8V nominal output (3.7V × 4) and up to 16.8V when fully charged. It includes approximately 6-inch color-coded wire leads (red for positive, black for negative) for easy soldering or direct connection to your circuit. A reliable way to build a high-voltage rechargeable Li-Ion battery pack for your electronics projects, prototypes, or DIY builds.

💡 Tip: Use only 18650 cells that are ~65 mm in length. Some protected 18650 cells are longer (68–70 mm) and may not fit properly.

⭐ Key Features

• 4× 18650 Series Configuration — Holds four 18650 Li-Ion batteries wired in series for a combined ~14.8V nominal output
• Wire Leads Included — Approximately 6" (15 cm) pre-attached wire leads for easy integration
• Color-Coded Wires — Red (positive) and black (negative) leads for quick polarity identification
• Lightweight Plastic Construction — Durable and lightweight plastic housing
• Spring Contacts — Reliable metal spring contacts ensure solid battery connection
• Open Frame Design — Easy battery insertion and removal
• Mounting Holes — Screw holes for secure board or enclosure mounting

📊 Specifications

🎯 Applications

• Arduino and microcontroller projects requiring higher voltage
• LED lighting circuits and high-power LED drivers
• Portable power banks and battery packs
• Electric motor and fan projects
• Robotics and RC projects
• Solar charging circuits
• Portable electronics prototyping
• Replacement battery compartments

📦 What's in the Box

• 1× Battery Holder Case for 4× 18650 Batteries with Wire Leads

Note: 18650 batteries are not included.

💡 Tips

• Always observe correct polarity when inserting batteries — match the + and − markings inside the holder.
• Use only 18650 cells that are ~65 mm in length. Some protected 18650 cells are longer (68–70 mm) and may not fit properly.
• Use batteries of the same brand, type, capacity, and charge level for best performance and safety.
• Strip and tin the wire leads before soldering for a clean, reliable connection.
• Always use a proper lithium-ion charger designed for 4S packs to charge the batteries — do not overcharge or over-discharge.
• A 4S battery protection circuit (BMS) is strongly recommended to prevent over-discharge, overcharge, and short circuits.
• Remove the batteries when the holder will not be used for an extended period.

⚠️ Important Notes

• Wire Current Limit: The included 24 AWG wire leads are rated for approximately 3.5A continuous. For higher-current applications, replace the leads with thicker gauge wire (e.g., 18–20 AWG) to prevent overheating.
• High Voltage Caution: A fully charged 4S Li-Ion pack outputs up to 16.8V. Exercise caution and ensure your circuit components are rated for this voltage.
• Do not mix batteries of different brands, capacities, or charge states — this can cause dangerous imbalances in a series configuration.
• Do not mix rechargeable and non-rechargeable cells.
• This holder does not include built-in battery protection. Always use an external BMS or protection circuit with Li-Ion batteries.

Sold and supported by Envistia Mall. Ships from the USA. The manufacturer and Envistia LLC (dba Envistia Mall) are not responsible for any damages or losses resulting from the use of this product. Always follow proper electrical safety practices when working with electronic components. Specifications are based on manufacturer data and are subject to change without notice.