What's in This Bundle
- 4x EVE INR18650-33V, 3,200mAh, 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 mid-capacity 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: EVE INR18650-33V Button Top + XTAR VC4SL 4 Bundle.
Why This Pairing Makes Sense
The 33V is EVE's NCM (nickel-cobalt-manganese) mid-capacity 18650, built for applications needing a solid balance of runtime and discharge capability — e-bikes, portable power tools, AGVs, and general battery pack builds. It carries a genuine 10A continuous discharge rating alongside its 3,200mAh capacity. 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. Flat Top is the standard terminal type for most current devices — DIY packs, tool battery builds, 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. Given the naming confusion noted above between the 33V and 33VA, that verification capability is a genuinely useful way to confirm you actually have the 3,200mAh cell you ordered.
EVE INR18650-33V — Battery Specs
| Parameter |
Value |
| Brand & Model |
EVE Energy INR18650-33V |
| Chemistry |
NCM (nickel-cobalt-manganese) |
| Capacity |
3,200mAh nominal (3,100mAh minimum) |
| Nominal Voltage |
3.6V |
| Max Charge Voltage |
4.2V |
| Standard Charge |
CC-CV, 0.5C (~1.6A), 0.02C cutoff |
| Discharge Cutoff Voltage |
2.5V |
| Max Continuous Discharge |
10A (3C) |
| AC Internal Resistance |
≤30mΩ |
| Charge Temperature |
0°C to 55°C |
| Discharge Temperature |
-20°C to 70°C (cell surface) |
| Cycle Life |
~800-1,000 cycles to 70% capacity (varies by source/test conditions) |
| Terminal Type |
Flat Top |
| Protection Circuit |
None (unprotected cell) |
| Weight |
48g max |
| Cell Dimensions |
Diameter ~18.35mm, Height 65mm |
These are genuine cells verified against EVE's official datasheet, not rewrapped or relabeled stock — and specifically the 3,200mAh 33V, not the related 3,300mAh 33VA.
This listing is for Flat Top. For Button Top, click here
XTAR VC4SL — Charger Specs
| Parameter |
Value |
| Input |
Type-C, QC3.0 (9V⎓2A) |
| Charging Current (CC) |
3A×1 / 2A×2 / 1A×4 / 0.5A×4 / 0.25A×4 — steps down automatically as more slots are occupied, or can be manually adjusted within what the slot count allows |
| Charging Method |
3-stage charging (trickle → constant current → constant voltage), 4 independently monitored slots, dynamic power allocation based on input power available |
| Cut-off Voltage |
4.2V ±0.05V (Li-ion) / 1.45V ±0.1V (Ni-MH/Ni-Cd) |
| Cut-off Current |
≤120mA |
| Operating Temperature |
0°C to 40°C |
| Dimensions |
L156mm x W115mm x H35mm |
| Net Weight |
212g |
| Display |
Color LCD — press Mode to cycle between capacity, current, and internal resistance readouts per slot in real time |
| Special Modes |
Capacity/grading mode (charge → discharge → recharge cycle to verify true capacity), storage mode (charges or discharges cells to their rated storage voltage to extend battery life), standard charge mode |
| Compatible Cell Sizes |
3.6V/3.7V Li-ion: 10440, 14500, 14650, 16340, 17335, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650, flat-top 32650. 1.2V Ni-MH/Ni-Cd: AAA, AA, A, SC, C. Supports protected 20700/21700 cells; spring-loaded slots can also fit two 32650s and two 18650s at once |
| Safety |
Reverse polarity protection (displays "Err," shows 0V, and stops automatically), auto cut-off when fully charged, multiple charge protections |
A realistic note on charge time: the 33V's own standard charge current is roughly 1.6A (0.5C), somewhat above the VC4SL's 1A-per-slot rate with all four bays occupied — expect a full charge in roughly 3.5-4 hours for all four cells at once, a safe and conservative rate relative to the cell's spec.
Why the Capacity Test Mode Matters for a 4-Pack
Given the naming overlap between the 33V and the higher-capacity 33VA, buying four cells and being able to actually verify their real measured capacity is a genuinely useful check — not just a nice-to-have. The VC4SL's grading mode runs each cell through a charge-discharge-recharge cycle and reports the actual result, so you can confirm you received the 3,200mAh cell you ordered and that all four are performing consistently before building them into a pack.
Where the 33V Actually Fits
-
E-bike and e-scooter packs — one of EVE's core application areas for this cell
-
AGVs, portable vacuums, and balance boards — moderate-drain equipment needing solid runtime
-
Power tool packs in parallel/series configurations
-
4S, 2S2P, or similar DIY pack builds where 10A per cell is sufficient
Not the right choice for sub-ohm mechanical mods, or anything regularly demanding more than 10A per cell — for those, a dedicated high-drain cell like the Samsung 25R or 30Q is a better match.
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 labeled 33V. Confirm you're not mixing a 33V with a 33VA, since they're different capacity ratings despite the similar name.
-
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.
-
10A is a real ceiling. Don't use these in devices that regularly demand more current than that.
Frequently Asked Questions
Is this the 3,200mAh or 3,300mAh version? This listing is the EVE 33V, rated at 3,200mAh nominal (3,100mAh minimum) per EVE's official datasheet. The 3,300mAh cell is a related but distinct SKU marketed as the "33VA" — if you need that specific capacity, confirm with us before ordering.
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. Given the naming overlap with the 33VA, that's a genuinely useful way to confirm what you actually have.
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 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 EVE INR18650-33V Flat Top cells with a verified XTAR VC4SL charger — ready for e-bike packs, power tools, and general electronics builds out of the box.
