Samsung 35E 3500mAh 8A Flat Top Battery 4-Pack with XTAR VC4SL Charger – High-Capacity Power Bundle for EDC Flashlights, Camping Lights & Portable Devices

What's in This Bundle

• 4x Samsung INR18650-35E, 3,450mAh, Flat 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 35E cells paired with a charger that does more than just charge: it tests, monitors, and reports on each cell individually.

This listing is for Flat Top. Looking for Button Top? Click here to buy: Samsung 35E Button Top + XTAR VC4SL 4 Bundle.

Why This Pairing Makes Sense

The 35E is Samsung's energy-focused 18650 — it trades discharge headroom for capacity, making it a better fit for devices that draw moderate, steady current rather than sharp bursts: power banks, UPS backups, low-drain flashlights, and similar gear. 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 — mismatched cells degrade pack performance faster than any single "bad" cell would on its own. Flat Top is the standard terminal type for most current devices — DIY packs, general electronics, and equipment that doesn't rely on spring-loaded 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 4-cell purchase like this, that verification capability is genuinely useful — you can confirm all four cells are performing consistently before you commit them to a build.

Samsung 35E — Battery Specs

This is an energy-density cell, not a high-drain one — its 8A continuous rating is meaningfully lower than cells like the 30Q or 25R. That's the trade-off for the extra capacity, and it's the right call if your device doesn't need to pull hard current. These are genuine cells verified against Samsung's official datasheet, not rewrapped or relabeled stock.

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

XTAR VC4SL — Charger Specs

A realistic note on charge time: the 35E's own max charge current is 2A, well above the VC4SL's 1A-per-slot rate with all four bays occupied — you've got real margin here, not a cell being pushed to its limit. With the included QC3.0 adapter/cable active, expect a full charge in roughly 4-4.5 hours for all four cells at once.

Why the Capacity Test Mode Matters for a 4-Pack

Buying four cells at once is exactly the scenario where verifying consistency pays off. The VC4SL's grading mode runs each cell through a charge-discharge-recharge cycle and reports its actual measured capacity — so instead of just trusting that all four cells hit their rated ~3,350mAh+, you can check for yourself before building them into a series or parallel pack. Cells with a wider gap during testing are worth flagging rather than mixing into a tight pack build.

Where This Bundle Actually Fits

• Power banks and backup power builds — steady, moderate draw is exactly what this cell is built for
• 4-cell UPS and emergency backup packs — capacity matters more than burst current in this use case
• Low-to-moderate output flashlights and headlamps run as a matched set of four
• DIY packs (2S2P, 4S, etc.) where matched internal resistance across all four cells genuinely matters

Not the right fit for sub-ohm high-output flashlights on turbo, or power tools — those applications need more discharge headroom than the 35E is rated for. If that's your use case, look at the 30Q or 25R instead.

Things Worth Knowing Before You Use This Kit

• The 35E 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 35E — that's exactly what the grading mode is for, if you want to check compatibility before combining batches.
• Flat Top won't work in devices that specifically require Button Top cells — check your device's battery compartment before ordering if you're not sure which terminal type it needs.
• Don't put these in a high-drain device expecting 30Q or 25R-level current. The 35E's 8A ceiling is a real limit, not a conservative underrating.
• For full charging speed, use the included QC3.0 adapter/cable — the VC4SL negotiates higher power with QC3.0 sources specifically.

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. It's a genuine diagnostic tool, not just a charge indicator.

Why is the 35E's discharge rating so much lower than other Samsung 18650 cells? It's a design trade-off, not a flaw. Samsung built the 35E to prioritize capacity over current delivery, which is why it holds more energy (3,450mAh) than cells like the 30Q (3,000mAh) or 25R (2,500mAh) but delivers less continuous current (8A vs. 15A or 20A).

Will Flat Top cells work in my device? If your device uses spring-loaded, flat, or magnetic-style contacts without a raised positive terminal requirement, Flat Top is the correct choice. If your device specifically calls for Button Top (a raised positive terminal), you'll want that version instead.

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's the difference between storage mode and grading mode? Storage mode charges or discharges a cell to its rated storage voltage to help preserve battery life during long-term storage. Grading mode runs a full charge-discharge-recharge cycle specifically to measure the cell's actual capacity.

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. Remove the cell, check its orientation, and reinsert.

In stock now. This bundle ships as a matched set of four genuine Samsung 35E Flat Top cells with a verified XTAR VC4SL charger — ready for power banks, backup packs, and other moderate-drain builds out of the box.