Panasonic Ncr21700t Datasheet Hot (720p — 2K)

Recommendation for Users: While the NCR21700T is a high-capacity cell (4.8Ah), it is optimized for energy density rather than power density. If your application runs "hot" (drawing >10A continuously), this cell may require significant cooling. For high-drain, hot-running applications, a different cell chemistry (like high-drain INR types) may be more appropriate.

Max Continuous Discharge Current: 30A - 35A (depending on thermal management)

Peak Discharge: Capable of higher bursts, though this significantly increases heat. End-of-Discharge Voltage: 2.5V (Standard cut-off) Thermal & Safety Guidelines

The "hot" designation in your query likely refers to the cell's thermal behavior under load. Operating Temperature (Discharge): -20∘Cnegative 20 raised to the composed with power C +60∘Cpositive 60 raised to the composed with power C

Surface Temperature Limit: It is critical to ensure the cell surface does not exceed 70∘C70 raised to the composed with power C 80∘C80 raised to the composed with power C

during high-drain operation to prevent permanent degradation or thermal runaway.

Internal Resistance: Low internal resistance is a hallmark of the "T" series, which helps minimize heat generation compared to standard high-capacity cells. Common Applications

Due to its high discharge rate and 4800mAh capacity, it is frequently used in: High-end power tools. Electric Vehicles (EVs) and E-bikes. High-performance flashlights. Custom battery packs for robotics.

Warning: Lithium-ion cells can be dangerous if mishandled. Always use a high-quality Battery Management System (BMS) and ensure the cells are properly insulated when building packs. panasonic ncr21700t datasheet hot

Here’s a forum-style post you can use or adapt for Reddit, DIY forums, or battery enthusiast groups.

Title: Digging into the Panasonic NCR21700T Datasheet – Why is this cell running hot?

Body:

Hey everyone,

I’ve been looking at the Panasonic NCR21700T datasheet (the 5300mAh / 15A cell), and I noticed something that keeps coming up in discussions – these cells can get surprisingly hot under moderate to high loads.

Quick specs from the datasheet:

The hot topic (pun intended):

Under sustained 10A–15A discharge, the cell temperature can climb into the 55–65°C range pretty fast, especially if there’s no active cooling. The datasheet’s own discharge curves show significant voltage sag at 15A, and temp rise is noted as a limiting factor – not just capacity loss. Recommendation for Users: While the NCR21700T is a

So why is it running hot?

Practical takeaways from the datasheet & real use:

✅ Best for: Flashlights (regulated), power banks, low-to-medium drain e-bikes, backup batteries.
❌ Not great for: High-drain vaping (at >15A), power tools, hotrod flashlights without thermal regulation.

⚠️ If you see “Panasonic NCR21700T hot” in reviews – it’s usually because someone pushed 20A+ (above spec) or enclosed it with no ventilation.

Safety note:
At 15A continuous, the cell’s surface can reach ~65°C. That’s hot to touch but still within operating limit (datasheet max 75°C before cutoff). Still, cycle life will degrade faster above 45°C.

Has anyone else measured surface temps on these at 10A+? Would love to compare notes.

Panasonic NCR21700T is a high-capacity, high-discharge lithium-ion cell widely used in power tools and electric vehicles. Below are its key technical specifications and a safety-focused usage guide. Core Specifications Typical Capacity Minimum Capacity 4800–4900 mAh Nominal Voltage Max Charge Voltage Max Continuous Discharge 30A (Peak 40A) Discharge Cut-off Weight (Max) 65.0g - 68.0g Temperature Operating Limits

Maintaining proper temperature is critical for safety and longevity. If the cell feels hot to the touch 60 raised to the composed with power cap C ), stop use immediately. 10 raised to the composed with power cap C positive 45 raised to the composed with power cap C Discharging: negative 20 raised to the composed with power cap C positive 60 raised to the composed with power cap C negative 20 raised to the composed with power cap C positive 50 raised to the composed with power cap C (Long term: room temperature in a dry area) Промелектроніка Usage & Safety Guide Title: Digging into the Panasonic NCR21700T Datasheet –

Panasonic NCR21700T is a high-capacity, high-discharge lithium-ion battery. While often associated with

cells due to its 21700 form factor and 5000mAh capacity, finding an official "public" datasheet directly from Panasonic can be difficult as these cells are primarily produced for high-volume industrial and automotive clients. Core Specifications

The following technical details are compiled from reputable retail and testing sources: Specification Typical Capacity Minimum Capacity 4800–4900 mAh Nominal Voltage Max Charge Voltage Discharge Cut-off Max Continuous Discharge 15A to 30A (Depending on source/thermal conditions) Peak Discharge Cycle Life >500 to 1000+ cycles ~66.8g to 70g Thermal & "Hot" Characteristics

When users search for "hot" datasheets, they are typically looking for thermal safety limits or high-temperature performance metrics. NCR21700 data sheet

Based on the datasheet, the NCR21700T is ideal for:

Who should avoid it:

Model: NCR21700T Manufacturer: Panasonic Format: 21700 Cylindrical Chemistry: NCA (Nickel Cobalt Aluminum) / Li-ion

Lab tests from sources like Mooch (battery test guru) and Lygte-info show:

Thus, when searching for "datasheet hot," users are looking for the thermal derating curve—which Panasonic published only in internal revisions, but third-party tests confirm that for safety, you should not exceed 10A continuous if you want the cell to stay below 50°C.