3-pack 18650 lithium battery pack with wires, laid side by side

Product Name: 3-cell 18650 Battery Holder (with Wires, Horizontal Side-by-Side Layout)

Appearance and Structural Features:
Overall Structure: This is a black, three-slot battery holder designed specifically for accommodating three 18650 cylindrical lithium batteries (diameter 18mm, length 65mm). The batteries are arranged in three parallel rows, giving the holder a flat rectangular shape that greatly optimizes space utilization. Ideal for devices with limited width but ample length.

Materials and Manufacturing:
Shell: The main body is made of black engineering plastic (usually PP or ABS) with a matte finish, providing good insulation and impact resistance.
Contacts: Each slot has a high-elasticity nickel-plated coil spring at one end (negative terminal) and a metal spring/connector at the other end (positive terminal) to ensure secure battery contact and reliable conductivity.

Functional Design (Key Features):
Wired Output: Red and black wires are led out from the side (red for positive, black for negative), with the ends pre-stripped for easy direct soldering or crimping of terminals, eliminating the need for secondary processing on the battery holder.
Mounting Holes: Round screw mounting holes are provided on the sides and bottom of the holder, allowing for secure fixation to the device's base plate or bracket to prevent displacement during use.
Polarity Indication: The slots clearly mark the positive and negative terminals (⊕ / ⊖) along with "3.7V" and "18650X3" to prevent incorrect battery installation.
Coverless Design: This is an open-type design that typically needs to be used in conjunction with a device's enclosure for protection and battery retention.

Dimension Specifications (Based on Image Labels):
Total Length: Approximately 75.4mm
Width: Approximately 61mm
Height: Approximately 19.5mm

Electrical Characteristics:
Voltage and Capacity: Three 18650 lithium batteries typically have a nominal voltage of 3.7V (about 4.2V when fully charged).
Connection Method: The internal circuit of this type of battery holder is usually designed for parallel connection (outputing approximately 3.7V with triple the total capacity). Following the common "18650X3" model convention, it is typically used in parallel unless otherwise specified, but series versions also exist. Users should confirm the actual output voltage with a multimeter before use.