Batteries & Charger

Reliable power is the lifeblood of all electronic devices. Whether you need high-drain 18650 batteries for a DIY project, a replacement AC/DC power adapter for your router, or a portable jump starter for automotive emergencies, we have the exact specifications you require. Backed by 20 years of retail experience in Sham Shui Po, our technical team provides on-site voltage testing and DC jack matching to ensure your equipment receives safe and stable power.

Power Supply & Battery Specifications Guide

Selecting the correct power source is critical to preventing hardware damage. Here is a technical breakdown of our core batteries and charging equipment:

Product Category Key Technical Specifications Best Use Case
Lithium Cylindrical Cells 18650 / 21700 (3.7V), High continuous discharge current High-power flashlights, DIY power banks, and custom IoT battery packs.
AC/DC Power Adapters 5V to 24V DC Output, Common 5.5x2.1mm / 2.5mm DC Jacks Powering Wi-Fi routers, CCTV cameras, LCD monitors, and LED strips.
Smart Car Battery Chargers 12V/24V Auto-detection, Pulse Repair Technology Trickle charging and desulfating aging Lead-Acid or AGM car batteries.
Universal Battery Chargers Multi-chemistry support (Li-ion, Ni-MH, LiFePO4), LCD readouts Safely charging and testing the capacity of individual cylindrical cells.

Important Note (Polarity & Battery Limitations): When replacing an AC/DC adapter, matching the voltage (V) and plug size is not enough; you must verify the polarity (usually Center Positive). Plugging in a Center Negative adapter into a Center Positive device will instantly fry the motherboard. Additionally, the flat-top 18650 cells we sell are "unprotected" bare cells. They do not have a built-in protection circuit and must only be used in devices with a dedicated Battery Management System (BMS) to prevent dangerous over-discharging.

Frequently Asked Questions (FAQ)

Q: My original adapter is 12V 2A. Can I safely use a 12V 5A adapter instead?
A: Yes, absolutely. A device will only draw the amperage (A) it needs. A 5A adapter will run cooler and last longer because it is not working at maximum capacity. However, you must never change the voltage (V). Using a 19V adapter on a 12V device will destroy it.

Q: Can a "Smart Car Battery Charger" jump-start my dead car instantly?
A: No. Smart chargers (maintainers) output low amperage (e.g., 7A) designed to slowly charge and repair a battery over several hours. If you are stranded and need to start your engine immediately, you must purchase a dedicated Portable Car Jump Starter, which contains a high-discharge lithium battery capable of delivering 800A+ of instant cranking power.