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18.2 × 50 mm · 37 g

18500NMC Mooch-tested · 15 A

Vapcell K15

Name: Vapcell K15 Lithium Battery Cell
Brand: Vapcell

Vapcell · released 2021

Capacity1500 mAh5.4 Wh · 145.95 Wh/kg

Mooch continuous15 ASize to this figure

Resistance20 mΩDC internal resistance

Voltage window3.6 V2.5 – 4.2 V

Standard charge500 mA~3 h to full

Build a pack with this cell →Download spec sheet (PDF)Open the datasheet Mooch's test ↗

At 1500 mAh, this ranks #2 of 3 18500 cells in our database. Mid-range for capacity among 18500 cells. Higher discharge than 100% of 18500 cells in our database. Great for high-drain builds.

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Full specifications

Electrical
Chemistry	NMC
Nominal voltage	3.6 V
Max charge voltage	4.2 V
Discharge cutoff	2.5 V
Max continuous discharge	15A (Mooch-tested)
Mooch CDR (trusted)	15 A
Standard charge current	500 mA
Internal resistance	20 mΩ
Physical
Form factor	18500
Dimensions	18.2mm × 50mm
Weight	37 g
Top type	Flat Top
Protected	No
Wrap color	Red
Performance
Capacity	1500 mAh
Energy	5.4 Wh
Specific energy	145.95 Wh/kg
Energy density	415.14 Wh/L
Power density (gravimetric)	1,459 W/kg
Power density (volumetric)	4,151 W/L
Year released	2021
Operating Limits
Charge temp	0°C to 45°C

Independent test data: Mooch's test of the K15 ↗

At the standard 500 mA charge rate, a full charge takes about 3 hours. The last bit is a slow taper to top it off.

Voltage operating window

Cutoff
2.5VNominal
3.6VMax charge
4.2V

Usable range: 1.7V

C-rate conversion: Vapcell K15 (1500mAh)

C-Rate	Current (A)	Theoretical runtime
0.2C	0.3 A	5h 00m
0.5C	0.75 A	2h 00m
1C	1.5 A	1h 00m
2C	3 A	30m
3C	4.5 A	20m
5C	7.5 A	12m
8C	12 A	7m 30s
10C	15 A	6m

Highlighted row is closest to the rated 15A continuous discharge.

Charging

Rate	Current	Estimated time
Standard	500 mA	~3h 00m
0.5C	750 mA	~2h 00m
1C	1,500 mA	~1h 00m

These are estimates for the constant-current phase. Real charge time is a bit longer because of the slow taper at the end.

Datasheet

Download official Vapcell K15 datasheet (PDF) ↗

Pack scaling

Series voltage configurations

Config	Nominal V	Max V	Min V	Common use
1S	3.6V	4.2V	2.5V	Flashlights, single-cell devices
2S	7.2V	8.4V	5V	RC vehicles, 7.2V packs
3S	10.8V	12.6V	7.5V	Power tools (10.8V nominal)
4S	14.4V	16.8V	10V	Ebike (small), some power tools
7S	25.2V	29.4V	17.5V	Ebike (24V system)
10S	36V	42V	25V	Ebike (36V system)
13S	46.8V	54.6V	32.5V	Ebike (48V standard)
14S	50.4V	58.8V	35V	Ebike (52V high-power)
16S	57.6V	67.2V	40V	DIY powerwall

Parallel capacity scaling

Config	Capacity	Energy	Max discharge
1P	1,500 mAh	5.4 Wh	15 A
2P	3,000 mAh	10.8 Wh	30 A
3P	4,500 mAh	16.2 Wh	45 A
4P	6,000 mAh	21.6 Wh	60 A
5P	7,500 mAh	27 Wh	75 A
6P	9,000 mAh	32.4 Wh	90 A

Example pack configurations

7S2P

24V ebike / small pack

14 cells25.2V nominal3,000mAh76Wh30A maxCell weight: 0.52 kg (add ~15% for wiring and BMS)

13S4P

48V ebike standard

52 cells46.8V nominal6,000mAh281Wh60A maxCell weight: 1.92 kg (add ~15% for wiring and BMS)

16S4P

DIY powerwall

64 cells57.6V nominal6,000mAh346Wh60A maxCell weight: 2.37 kg (add ~15% for wiring and BMS)

4S6P

Power tool replacement

24 cells14.4V nominal9,000mAh130Wh90A maxCell weight: 0.89 kg (add ~15% for wiring and BMS)

Design a custom pack with this cell:

Pack Planner →Pack Designer →

Application suitability

PowerwallsUsable for powerwalls but lower capacity means you'll need more cells to hit your target kWh.

Ebike PacksNot enough discharge for ebike use. Voltage sag would be a problem under load.

Car AudioMight work for smaller setups. Check your amp's peak current draw.

High-Drain VapingUsable in regulated mods at moderate wattage. Not recommended for mechanical mods.

FlashlightsLower capacity means shorter runtime. Better cells are available for flashlight use.

Power ToolsSufficient discharge and capacity for most power tool packs.

Physical dimensions

Dimensions18.2mm × 50mm

TopFlat Top

Format18500

Build with this cell

Pack PlannerSize your pack. Voltage, capacity, runtime, BMS.Pack Designer2D & 3D layout for your exact cell arrangement Pack BuilderBalance cells by capacity and internal resistance

Frequently asked questions

What is the capacity of the Vapcell K15?

What is the maximum discharge rate of the Vapcell K15?

How many K15 cells do I need for a 48V ebike battery?

What does the Vapcell K15 weigh?

Can I use the K15 for vaping?

What size is the Vapcell K15?

Handling and safety

Lithium cells can be dangerous if mishandled. A few things to keep in mind:

Never charge above 4.2V or discharge below 2.5V.
Store cells at around 3.6-3.8V (roughly 40-60% charge) for long-term storage.
Don't mix cells with different capacities, chemistries, or states of charge in a pack.
Inspect wraps before use. A torn wrap can cause a short circuit.
Always use a BMS or balance charger appropriate for your pack configuration.
Keep cells away from metal objects, keys, and coins. A short across the terminals can cause fire.

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Specs come from manufacturer datasheets and independent testing; Mooch-tested discharge ratings are shown when available because they reflect real continuous performance better than headline datasheet numbers. Browse the full 18650 & 21700 cell database to compare every cell.

Disclaimer: We do our best to keep the information on this page accurate, but we cannot guarantee that all specifications are correct or up to date. Cell characteristics can vary between production batches and may change over time. Do not rely solely on this data for safety-critical applications. Always verify against the manufacturer's official datasheet before use.