What's in This Bundle
- 8x Samsung INR18650-30Q, 3000mAh, Button Top
- 1x XTAR VC8 8-slot LCD USB-C charger
- USB-A to USB-C charging cable and user manual included
A complete kit for anyone running an 8-cell device or building a larger pack — eight matched, genuine 30Q cells paired with a charger built specifically for handling a full set like this, with independent circuitry per slot and real capacity diagnostics.
This listing is for Button Top. Looking for Flat Top? Click here to buy: Samsung 30Q Flat Top + XTAR VC8 Bundle.
Why This Pairing Makes Sense
Eight 30Qs bought together as a matched set means consistent capacity and internal resistance across the whole group — the more cells you're combining into a pack, the more a single mismatched cell can drag down overall performance, so buying and verifying a matched set matters even more here than it does for smaller bundles. Button Top is the terminal type required by devices with spring-loaded battery contacts.
The XTAR VC8 is built around eight fully independent charging circuits — XTAR describes each slot as functioning like its own small charger, so one slot's charging behavior doesn't affect the others. It also runs a genuine capacity-test (grading) mode on four of its eight slots, letting you verify real measured capacity rather than just trusting the printed rating.
Samsung 30Q — Battery Specs
| Parameter |
Value |
| Brand & Model |
Samsung SDI INR18650-30Q |
| Capacity |
3,000mAh (minimum ~2,900mAh) |
| Nominal Voltage |
3.6V |
| Full Charge Voltage |
4.2V |
| Discharge Cutoff Voltage |
2.5V |
| Max Continuous Discharge |
15A |
| Terminal Type |
Button Top |
| Protection Circuit |
None (unprotected cell) |
| Weight |
~45-48g per cell |
These are genuine cells verified against Samsung's official datasheet, not rewrapped or relabeled stock.
This listing is for Button Top. For Flat Top click here
XTAR VC8 — Charger Specs
| Parameter |
Value |
| Input |
Type-C, QC3.0 (5V⎓2A / 9V⎓2A) |
| Charging Current (CC) |
3A×1 / 2A×2 / 1A×4 / 0.5A×8 / 0.25A×8 — adjustable, current per slot depends on how many slots are in use |
| Manual Current Gears |
250mA or 500mA with all 8 slots occupied; 1000mA with 4 slots occupied; up to 2000mA on CH1/CH8 specifically |
| Charging Method |
TC-CC-CV 3-stage charging (trickle wake-up → constant current fast charge → constant voltage top-off) |
| Cut-off Voltage |
4.20V ±0.05V (Li-ion) / 1.45V ±0.1V (Ni-MH/Ni-Cd) |
| Cut-off Current |
≤120mA |
| Operating Temperature |
0°C to 40°C |
| Dimensions |
L194mm x W134mm x H34mm |
| Net Weight |
350g |
| Display |
Dual VA LCD screens showing real-time voltage, current, capacity, and internal resistance across all 8 slots |
| Special Modes |
Capacity/grading mode (charge → discharge → recharge to verify true capacity) — available on CH1-CH4 only; storage mode (available across slots) |
| Compatible Cell Sizes |
3.6V/3.7V Li-ion: 10440, 14500, 14650, 16340, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650. 1.2V Ni-MH/Ni-Cd: AAAA, AAA, AA, A, SC, C, D. Supports protected 20700/21700 cells |
| Extra Feature |
"0V" activation — can recover some over-discharged cells |
| Safety |
Overvoltage, overcurrent, short-circuit, overcharge, and reverse-polarity protection; real-time internal temperature monitoring for stable heat management during full 8-slot use |
| Certifications |
RoHS, CE, FCC |
An important note on the grading/capacity test mode: only CH1 through CH4 support the charge-discharge-recharge capacity test — the other four slots (CH5-CH8) handle standard charging only. If verifying real measured capacity across all eight cells matters to you, plan to run them through CH1-CH4 in two batches of four rather than expecting all eight slots to test simultaneously.
A realistic note on charge time: with all 8 slots occupied, the VC8's default charging current is 0.5A per slot (adjustable down to 0.25A if you prefer an even gentler rate). At 0.5A, a full charge for all eight 30Qs takes roughly 6.5-7 hours. That's slower per-cell than a 4-slot charger running at 1A, which is the trade-off for charging twice as many cells from one unit — CH1 and CH8 can individually push higher current (up to 2A or 3A) if you're not using all 8 slots at once.
Where This Bundle Actually Fits
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8-cell flashlights, lanterns, and larger DIY builds — devices or packs designed around a full set of eight cells
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Power tool and e-bike battery packs where you're assembling from a larger verified batch
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Builders who want ongoing diagnostic capability — the VC8's grading mode (CH1-CH4) is useful well beyond this one purchase, for testing any future cells you pick up
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Mixed-chemistry households — since the VC8 also handles Ni-MH/Ni-Cd cells (AA, AAA, C, D, etc.) with automatic detection, it can pull double duty beyond just 18650s
Things Worth Knowing Before You Use This Kit
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The 30Q 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 30Q — run a batch through CH1-CH4's grading mode first if you want to check consistency before combining.
-
Only CH1-CH4 support capacity grading. Keep that in mind if you're planning to test all eight cells before a pack build.
Frequently Asked Questions
Can all 8 cells charge at once? Yes — all 8 slots operate independently and can charge simultaneously, though the per-slot current drops to 0.5A (or less) when all 8 are occupied, compared to higher rates available with fewer slots in use.
Can this charger test the real capacity of all 8 cells? Only four at a time. CH1-CH4 support the grading (capacity test) mode; CH5-CH8 handle standard charging only. Run your first four cells through CH1-CH4, then swap in the remaining four for a second round if you want all eight tested.
Does this charger work with rechargeable AA/AAA batteries too? Yes — the VC8 automatically detects Ni-MH/Ni-Cd chemistry and applies the appropriate charging strategy alongside Li-ion cells, across sizes from AAAA up to D and C.
What happens if I insert a cell backwards? The charger's reverse-polarity protection stops that slot from charging and flags the issue rather than attempting to force a charge.
Is this kit protected-cell compatible? The VC8 supports protected 20700/21700 cells if you use it for those later. The Samsung 30Q cells included in this bundle are unprotected bare cells, which is standard for this model.
What does the "0V activation" feature do? It lets the charger attempt a slow, controlled charge on cells drained deep enough that a standard charger would refuse to recognize them at all. It won't save every over-discharged cell, but it can recover some that would otherwise be written off.
In stock now. This bundle ships as a matched set of eight genuine Samsung 30Q Button Top cells with a verified XTAR VC8 charger — independent 8-slot charging with real capacity diagnostics, ready for larger builds out of the box.
