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

Product Name: 4-cell 18650 Lithium Battery Holder (with Wires, Horizontal Arrangement)

Appearance and Structural Features:
Overall Structure: This is a black four-slot battery holder designed specifically for accommodating four cylindrical lithium batteries of the 18650 size (diameter 18mm, length 65mm). The batteries are arranged in four parallel rows, giving the holder an almost square shape, which greatly optimizes the use of space and makes it ideal for installation in flat, wide-bottomed device bases.

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/connector 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: Multiple 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 poles (⊕ / ⊖) along with "3.7V" and "18650X4" 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, which provides protection and battery retention.

Dimensions (Based on Image Labels):
Total Length: Approximately 80mm
Width: Approximately 74.7mm
Height: Approximately 20.5mm

Electrical Specifications:
Voltage and Capacity: Four 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 four times the combined capacity). Following the common "18650X4" model convention, it's usually 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.