What's in This Bundle
- 2x Samsung INR18650-30Q, 3000mAh, Button Top
- 1x XTAR MC2 dual-slot USB charger
- 1x USB-C charging cable (included with the charger)
This is a ready-to-go starter kit for anyone who needs two matched, genuine 18650 cells and a compact way to charge them — no separate charger purchase, no guessing whether the charger you already own is a safe match for these cells.
If you need the Flat Top version of this Samsung 30Q + XTAR MC2 kit, please click here to purchase.
Why This Pairing Makes Sense
The Button Top 30Q is the terminal type required by devices with spring-loaded battery contacts — most dual-cell flashlights, headlamps, and similar gear that don't use flat-contact battery compartments. Pairing two cells together as a set (rather than buying singles) means you're starting with two cells from a similar batch, which matters for devices that run cells in series or expect matched performance between them.
We chose the MC2 for this bundle not just for its steady 1A charge, but also for its 0V activation technology — it can safely revive over-discharged 30Q cells that other chargers would simply reject. This one feature alone can save you from throwing away a perfectly good battery.
The XTAR MC2 is a compact, genuinely portable charger that still delivers a full 1A to each slot at the same time — no current-splitting trade-off just because both bays are in use. It's a safe, well-documented option that's small enough to travel with, without asking you to sacrifice charge speed for that portability. If you're building a first 18650 kit and don't want to invest in a larger multi-bay charger yet, this combination covers both pieces you need in one order.
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. See our full Samsung 30Q product page for detailed test data and authenticity-checking tips if you want to go deeper than what's covered here.
XTAR MC2 — Charger Specs
| Parameter |
Value |
| Input |
Type-C, 5V⎓2A |
| Charging Current |
1A per slot — both slots charge simultaneously at a full 1A each, not shared/split between them |
| Charging Method |
3-stage charging (trickle → constant current → constant voltage), 2 independent slots with automatic chemistry/size detection |
| End-of-Charge Voltage |
4.2V ±0.05V |
| End-of-Charge Current |
<130mA cutoff |
| Operating Temperature |
0°C to 40°C |
| Dimensions |
L103mm x W53mm x H30mm |
| Weight |
54g |
| Compatible Cell Sizes |
3.6V/3.7V Li-ion, sizes 10440 through 26650 (10440, 14500, 14650, 16340, 17335, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650), including protected 21700 cells |
| Extra Feature |
"0V" activation technology — can recover some over-discharged cells that many basic chargers would otherwise reject |
| Status Indicators |
Green = standby/fully charged, Red = charging, Off/unlit = reverse polarity or other abnormal insertion |
| Safety |
Reverse polarity protection, short-circuit protection, 3-stage charge control to avoid overcharging while keeping cells fully topped off |
A realistic note on charge time: at a full 1A per slot — both cells charging at once, no current splitting between the two bays — a 30Q charges from empty to full in roughly 3.5-4 hours, accounting for the tapering constant-voltage stage near the end. That's a genuinely fast charge for a compact USB charger this size, not a compromise you're making for portability.
This listing is for Flat Top. For Flat Top, click here
Things Worth Knowing Before You Use This Kit
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The 30Q is an unprotected cell. The charger has its own safety cutoffs (voltage and current), but your device still needs to handle discharge-side protection — don't run these in a device with no low-voltage cutoff of its own.
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Don't mix these cells with older ones you already own, even if they're also 30Q. Pairing cells from different ages or usage histories in a series/parallel setup can cause imbalanced charging over time.
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The charger detects cell chemistry and size automatically, but it's still a good habit to check that both slots show a normal charging indicator after inserting cells — a cell that isn't registering properly is more likely a sign of a bad connection than something to force.
Frequently Asked Questions
Can this charger handle the Samsung 30Q's full capacity safely? Yes. The MC2 charges at a full 1A per slot, which is a safe, standard charging rate for a 3,000mAh cell — you'll see a full charge in roughly 3.5-4 hours, both cells at once.
Do I need a separate charger if I already own flat top 30Q cells? No — the MC2 charges any standard 18650 regardless of terminal type. This bundle is specifically packaged with Button Top cells because that's the terminal type devices with spring contacts require, not because the charger cares about terminal shape.
Can I charge two different battery sizes at once? Yes, the MC2's two slots operate independently with automatic size and chemistry detection, so you could charge one 18650 and one differently-sized cell (like a 21700) at the same time if needed — though this bundle is set up for two 30Qs.
Is this kit protected-cell compatible? The MC2 supports protected 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 happens if I insert a cell backwards? The MC2's LED indicator for that slot will simply stay off rather than turning red or green, signaling a reverse-polarity or abnormal insertion — the charger won't attempt to charge until it's corrected.
What does the "0V activation" feature actually do? It lets the charger attempt a slow, controlled charge on cells that have been 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 pair of genuine Samsung 30Q Button Top cells with a verified XTAR MC2 charger — everything you need to get a dual-cell device running safely out of the box.
Authentic Samsung Cells – sourced from official distributors. No rewraps, no fakes.
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