Product Description:
Upgrade your devices with the premium FDK / Sony 14500CY 3.8V 900mAh Li-ion Flat Top Battery (2-Pack). This is a Bare Flat Top Cell (No Solder Tabs). Unlike standard 3.7V 14500 cells, this advanced INR15/50 cylindrical cell delivers an impressive 3.8V nominal voltage and a massive 900mAh capacity, providing superior energy density (3.42Wh) for devices that require extended runtime.
Whether you are powering high-performance EDC flashlights, upgrading DIY electronics, or building custom battery packs, this Japanese-origin cell offers reliable, stable discharge and exceptional longevity.
Important Note:
This is a Bare Flat Top battery. It does NOT come with any pre-welded solder tabs. It is designed for use in standard flashlight battery compartments (spring-loaded) or for DIY spot-welding into custom battery packs.
Voltage Warning: This is a High-Voltage Li-ion cell (3.8V, fully charged to 4.35V). Please confirm that your device's driver circuit can handle a fully charged voltage of up to 4.35V to avoid performance or overheating issues.
Key Features:
High Capacity 900mAh & 3.8V Output: A significant upgrade over traditional 3.7V 680-750mAh cells, delivering 3.42Wh of total energy.
Premium Japanese Quality: Manufactured by FDK/Sony (INR15/50), ensuring low internal resistance, consistent voltage, and exceptional safety standards.
Standard Flat Top Design: Bare cell (No Tabs), perfect for spring-loaded flashlight contacts or custom spot-welding projects.
Long Cycle Life: Supports 500+ recharge cycles, making it an economical and eco-friendly power solution.
Convenient 2-Pack: Always have a spare charged battery ready for your EDC gear.
Parameters:
Applications:
High-Performance EDC Flashlights & Tactical Torches (check 4.35V compatibility)
DIY Electronics & Prototyping (Arduino, ESP32)
Custom Battery Pack Building (Spot welding required)
Replacement for older 3.7V 14500 flat-top cells
Emergency Outdoor Gear and Bike Lights
FAQ:
Q: Does this battery come with solder tabs?
A: No, this is a Bare Flat Top cell. It does not come with any solder tabs. It is designed for standard flashlight spring contacts or DIY spot-welding.
Q: What is the difference between this 3.8V battery and a standard 3.7V battery?
A: A 3.8V battery (often called HV or High Voltage) reaches a maximum full charge of 4.35V, whereas standard 3.7V cells only reach 4.20V. This provides higher runtime, but ensure your device supports this voltage.
Q: Can I use this in my normal 3.7V flashlight?
A: In most LED flashlights, it works perfectly. However, if your flashlight gets very hot quickly, stop using it, as the driver might not be designed for 4.35V.
Q: Is this battery protected (with a built-in PCB)?
A: No. This is an unprotected bare cell. It relies on your device's built-in protection circuitry.
