The NCR21700T is a "21700" format cell, meaning it has a 21mm diameter and 70mm height. Below are the primary electrical characteristics derived from technical data: : 4800mAh to 5000mAh. Nominal Voltage : 3.6V. Charging Voltage : 4.2V. Discharge Cut-off Voltage : 2.5V.
High capacity per cell reduces the total cell count needed. High-Power Power Tools: Cordless vacuums, saws, and drills.
When discharging at continuous loads approaching 15A to 20A or higher, the internal resistance (IR) of the cell generates significant heat.
If you are considering this cell for a new project, I can help you find official distributors, analyze its performance compared to the LG M50T, or provide advice on optimal battery management systems (BMS) for managing heat. NCR21700 data sheet
The surge in search interest for the stems from its highly sought-after high-capacity/high-drain profile and the mystery surrounding its official documentation. Because Panasonic primarily manufactures these cells for industrial clients and EV OEMs (like Tesla), official datasheets are rarely published directly to the public.
If your NCR21700T is hot after use, wait 45 minutes before charging. Place it on a metal tray (not a plastic charger) to dissipate heat. Only charge at 0.5C (2.2A) or less. Rapid charging at 5.8A will turn a warm cell into a hand grenade.
The NCR21700T follows the standard 21700 format:
A hot topic surrounding the NCR21700T datasheet is its origin. Panasonic does not heavily market a retail version of this exact designation. Community teardowns and data analysis on the Endless Sphere EV Forum reveal that these cells are widely harvested or repurposed from , where they feature ultrasonic aluminum wire-bonding marks on the casing. Because they deliver massive capacities along with massive current delivery at an affordable price, they have become incredibly "hot" in the DIY electric vehicle (EV), e-bike, high-powered flashlight, and custom power pack communities. 📊 Core Technical Specifications Overview
If designing a system that will experience high heat, it is safer to limit the continuous load closer to 10A-12A to keep the cell temperature under control.
Master Guide to the Panasonic NCR21700T Datasheet: Specs, High-Drain Performance, and EV Origins