Panasonic NCR18650-B 3400mAh Button Top Battery 4-Pack with XTAR VC4SL Charger – Ultra-High Capacity Long-Run Kit for Flashlights, Camping Lights & Radios

What's in This Bundle

• 4x Panasonic NCR18650B, 3,400mAh, Button Top
• 1x XTAR VC4SL 4-slot LCD USB-C charger
• 1x Type-C QC3.0 fast-charge cable, storage pouch, and manual (included with the charger)

A complete kit for anyone running a 4-cell device or building a small pack — four matched, genuine high-capacity cells paired with a charger that does more than just charge: it tests, monitors, and reports on each cell individually.

A note on terminal style: the NCR18650B is manufactured by Panasonic primarily as a flat top cell — it's the terminal style you'll see on most genuine factory packaging. The Button Top version in this listing uses an added contact spring/spacer to convert it for devices that require a raised positive terminal. Electrically, this doesn't change the cell's specs; it's a mechanical adapter, not a different internal cell.

This listing is for Button Top. Looking for Flat Top? Click here to buy: Panasonic NCR18650B Flat Top + XTAR VC4SL 4 Bundle.

Why This Pairing Makes Sense

The NCR18650B is one of the highest-capacity mainstream 18650 cells available — it earned its reputation in laptop battery packs and early EV applications before becoming a favorite for high-capacity flashlights and DIY packs where runtime matters far more than burst current. Four cells bought together as a matched set means consistent capacity and internal resistance across the group, which matters for anything running cells in series or parallel. Button Top is the terminal type required by devices with spring-loaded battery contacts.

The XTAR VC4SL is a real step up from a basic charger: an LCD display showing live capacity, current, and internal resistance per slot, plus a capacity-test (grading) mode that charges, discharges, and recharges a cell to verify its actual capacity rather than just trusting the label. For a cell like the NCR18650B — where you'll see wildly different discharge ratings advertised across the market — having a charger that reports real, measured numbers is genuinely useful for cutting through that confusion.

Panasonic NCR18650B — Battery Specs

A note on discharge current claims: you'll see this cell advertised elsewhere at 6.7A or 6.8A continuous. That figure doesn't match Panasonic's own published spec sheet, which lists 4.875A as the maximum continuous discharge rating. This is a genuine high-capacity, moderate-drain cell — not a high-drain one.

This listing is for Button Top. For Flat Top click here

XTAR VC4SL — Charger Specs

A realistic note on charge time: the VC4SL's 1A-per-slot rate (with all four bays occupied and the QC3.0 adapter active) is a bit below the NCR18650B's own 1.625A standard charge current, so expect a full charge in roughly 4-4.5 hours for all four cells at once — slower than Panasonic's own reference rate, but well within a safe range.

Why the Capacity Test Mode Matters Here

The NCR18650B is a cell with genuinely inconsistent specs floating around online — you'll see it marketed anywhere from 4.875A to 6.8A depending on the seller. Buying four cells and being able to actually test their real capacity and internal resistance, rather than relying on whatever number happens to be printed on a listing, is a meaningful way to know what you actually bought. The VC4SL's grading mode runs each cell through a full charge-discharge-recharge cycle and reports the measured result.

Where This Bundle Actually Fits

• High-capacity flashlights run at low-to-moderate output — long runtime is the whole point of this cell
• Laptop-style and general electronics packs — its original and most common use case
• 4S, 2S2P, or similar DIY pack configurations where energy density matters more than discharge rate
• Power banks and backup power builds built from a verified, matched set of four

Not the right choice for sub-ohm  high-output flashlights on turbo, or power tools — this cell's discharge ceiling is meaningfully lower than dedicated high-drain cells like the 30Q, 25R, or 20R.

Things Worth Knowing Before You Use This Kit

• This is an unprotected cell. The charger enforces its own voltage and current cutoffs, but your device still needs to handle discharge-side protection.
• Don't mix these cells with older ones you already own, even if they're also NCR18650B — that's exactly what the grading mode is for, if you want to check compatibility before combining batches.
• Don't put these in a high-drain device. A 4.875A ceiling is a real limit — pushing this cell toward the 6-7A figures sometimes advertised elsewhere risks excess heat and accelerated wear.

Frequently Asked Questions

Can this charger really tell me if a cell is underperforming? Yes — the grading/capacity test mode charges, discharges, and recharges a cell while measuring the actual capacity delivered, rather than relying on the printed rating. For a cell like the NCR18650B, where marketed specs vary a lot between sellers, that's a genuinely useful way to verify what you have.

Why do different sellers list different max discharge ratings for this cell? Panasonic's own datasheet lists 4.875A as the maximum continuous discharge current. Some listings advertise 6.7A or 6.8A, which doesn't match that primary source — treat the higher figures with caution rather than as confirmed specs.

Is Button Top a "real" Panasonic configuration? Panasonic manufactures the NCR18650B primarily as a flat top cell. The Button Top version here uses an added contact spring to convert it for devices that require a raised positive terminal — the cell inside is the same genuine Panasonic NCR18650B either way.

Do I need to charge all four cells at once? No — each of the four slots operates independently, so you can charge one, two, three, or four cells at a time, and mix different cell sizes or even NiMH batteries across the slots if needed.

What happens if I insert a cell backwards? The display shows "Err" for that slot and the voltage reading drops to 0 — the charger stops working on that slot automatically rather than attempting to charge.

In stock now. This bundle ships as a matched set of four genuine Panasonic NCR18650B Button Top cells with a verified XTAR VC4SL charger — ready for high-capacity flashlights, power banks, and other moderate-drain builds out of the box.