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

Product Name: 2-cell 18650 Battery Holder (with Wires, Horizontal Side-by-Side Layout)

Appearance and Structural Features:
Overall Structure: This is a black dual-slot battery holder designed specifically for two 18650 cylindrical lithium batteries (diameter 18mm, length 65mm). It features a side-by-side layout, giving it 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 pole) and a metal spring/contact at the other end (positive pole), ensuring 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 movement during use.
Polarity Marking: The slots clearly indicate positive and negative poles (⊕ / ⊖) along with "3.7V" and "OR UM-18650X2" to prevent incorrect battery installation.
Open Design: It's an open-type structure and typically needs to be used in conjunction with a device's enclosure for protection and battery retention.

Dimension Specifications (Based on Drawings):
Total Length: Approximately 76mm
Width: Approximately 41mm
Height: Approximately 19mm

Electrical Characteristics:
Voltage and Capacity: Two 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 doubled capacity). Following the common "OR UM-18650X2" model convention, it's typically used in parallel unless otherwise specified, but there are also series versions available. Users should confirm the actual output voltage with a multimeter before use.