Battery Building ToolsCell Database ICR18650-20C

✱ Render

18.4 × 65 mm

18650NMC

Samsung ICR18650-20C

Name: Samsung ICR18650-20C Lithium Battery Cell
Brand: Samsung

Samsung

Capacity2000 mAh7.4 Wh

Rated continuous4 A4A

Voltage window3.7 V2.8 – 4.2 V

Standard charge1000 mA~2 h to full

Build a pack with this cell →Download spec sheet (PDF)

At 2000 mAh, this ranks #127 of 169 18650 cells in our database. On the lower end for capacity among 18650 cells. A mid-range 18650 cell. Solid for builds that don't need extreme capacity or discharge.

Full specifications

Electrical
Chemistry	NMC
Nominal voltage	3.7 V
Max charge voltage	4.2 V
Discharge cutoff	2.8 V
Max continuous discharge	4A
Standard charge current	1000 mA
Standard discharge current	400mA
Physical
Form factor	18650
Dimensions	18.4mm × 65mm
Top type	Flat Top
Protected	No
Wrap color	Blue (Light)
Insulator ring	White
Performance
Capacity	2000 mAh
Energy	7.4 Wh
Energy density	428.15 Wh/L
Power density (volumetric)	856 W/L
Operating Limits
Charge temp	0°C to 45°C
Discharge temp	-20°C to 60°C

At the standard 1000 mA charge rate, a full charge takes about 2 hours. The last bit is a slow taper to top it off.

Voltage operating window

Cutoff
2.8VNominal
3.7VMax charge
4.2V

Usable range: 1.4V

C-rate conversion: Samsung ICR18650-20C (2000mAh)

C-Rate	Current (A)	Theoretical runtime
0.2C	0.4 A	5h 00m
0.5C	1 A	2h 00m
1C	2 A	1h 00m
2C	4 A	30m

Highlighted row is closest to the rated 4A continuous discharge.

Charging

Rate	Current	Estimated time
0.5C	1,000 mA	~2h 00m
1C	2,000 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.

Pack scaling

Series voltage configurations

Config	Nominal V	Max V	Min V	Common use
1S	3.7V	4.2V	2.8V	Flashlights, single-cell devices
2S	7.4V	8.4V	5.6V	RC vehicles, 7.2V packs
3S	11.1V	12.6V	8.4V	Power tools (10.8V nominal)
4S	14.8V	16.8V	11.2V	Ebike (small), some power tools
7S	25.9V	29.4V	19.6V	Ebike (24V system)
10S	37V	42V	28V	Ebike (36V system)
13S	48.1V	54.6V	36.4V	Ebike (48V standard)
14S	51.8V	58.8V	39.2V	Ebike (52V high-power)
16S	59.2V	67.2V	44.8V	DIY powerwall

Parallel capacity scaling

Config	Capacity	Energy	Max discharge
1P	2,000 mAh	7.4 Wh	4 A
2P	4,000 mAh	14.8 Wh	8 A
3P	6,000 mAh	22.2 Wh	12 A
4P	8,000 mAh	29.6 Wh	16 A
5P	10,000 mAh	37 Wh	20 A
6P	12,000 mAh	44.4 Wh	24 A

Example pack configurations

7S2P

24V ebike / small pack

14 cells25.9V nominal4,000mAh104Wh8A max

13S4P

48V ebike standard

52 cells48.1V nominal8,000mAh385Wh16A max

16S4P

DIY powerwall

64 cells59.2V nominal8,000mAh474Wh16A max

4S6P

Power tool replacement

24 cells14.8V nominal12,000mAh178Wh24A max

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 AudioNot enough discharge for car audio amplifiers. You need at least 15-20A continuous for most setups.

High-Drain VapingBelow the 25A Mooch CDR threshold that high-drain vaping needs. Use a higher-drain cell.

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

Power ToolsNot enough discharge or capacity for power tool use.

Physical dimensions

Dimensions18.4mm × 65mm

TopFlat Top

Format18650

Similar cells

Same format and chemistry, within ±500mAh capacity:

Cell	mAh	CDR	Wh	Weight	Wh/kg
Samsung ICR18650-20C (this cell)	2000	4A	7.4	—	—
LG LGDBHE21865	2500	20A	9.3	48g	193
Sanyo UR18650F	2500	5A	9.3	47g	197
Sanyo UR18650FM	2500	5A	9.3	47g	197
LG LGCP218650	2500	—	9	—	—
LG LGDBHE41865	2500	20A	9	47g	191

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 Samsung ICR18650-20C?

What is the maximum discharge rate of the Samsung ICR18650-20C?

How many ICR18650-20C cells do I need for a 48V ebike battery?

Can I use the ICR18650-20C for vaping?

What temperature range can the ICR18650-20C operate in?

What size is the Samsung ICR18650-20C?

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 2.8V.
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.