Battery Building ToolsCell Database EFEST 35A 2900mAh

✱ Render

18650LMO Mooch-tested · 35 A

Efest EFEST 35A 2900mAh

Name: Efest EFEST 35A 2900mAh Lithium Battery Cell
Brand: Efest

Efest · released 2015

Capacity2900 mAh10.44 Wh

Mooch continuous35 ASize to this figure

Voltage window3.6 V2.5 – 4.2 V

Standard charge2000 mA~1.5 h to full

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

At 2900 mAh, this ranks #72 of 279 18650 cells in our database. Mid-range for capacity among 18650 cells. Higher discharge than 94% of 18650 cells in our database. Great for high-drain builds.

Photos from the community

See the wrap, markings, and terminals up close.

Have this cell in hand?

Community photo submissions are opening soon.

Full specifications

Electrical
Chemistry	LMO
Nominal voltage	3.6 V
Max charge voltage	4.2 V
Discharge cutoff	2.5 V
Max continuous discharge	35A (Mooch-tested)
Mooch CDR (trusted)	35 A
Standard charge current	2000 mA
Physical
Form factor	18650
Top type	Flat Top
Protected	No
Wrap color	Purple
Performance
Capacity	2900 mAh
Energy	10.44 Wh
Year released	2015

Independent test data: Mooch's test of the EFEST 35A 2900mAh ↗

At the standard 2000 mA charge rate, a full charge takes about 1.5 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: Efest EFEST 35A 2900mAh (2900mAh)

C-Rate	Current (A)	Theoretical runtime
0.2C	0.58 A	5h 00m
0.5C	1.45 A	2h 00m
1C	2.9 A	1h 00m
2C	5.8 A	30m
3C	8.7 A	20m
5C	14.5 A	12m
8C	23.2 A	7m 30s
10C	29 A	6m

Highlighted row is closest to the rated 35A continuous discharge.

Charging

Rate	Current	Estimated time
0.5C	1,450 mA	~2h 00m
Standard	2,000 mA	~1h 27m
1C	2,900 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	3.6V	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	2,900 mAh	10.4 Wh	35 A
2P	5,800 mAh	20.9 Wh	70 A
3P	8,700 mAh	31.3 Wh	105 A
4P	11,600 mAh	41.8 Wh	140 A
5P	14,500 mAh	52.2 Wh	175 A
6P	17,400 mAh	62.6 Wh	210 A

Example pack configurations

7S2P

24V ebike / small pack

14 cells25.2V nominal5,800mAh146Wh70A max

13S4P

48V ebike standard

52 cells46.8V nominal11,600mAh543Wh140A max

16S4P

DIY powerwall

64 cells57.6V nominal11,600mAh668Wh140A max

4S6P

Power tool replacement

24 cells14.4V nominal17,400mAh251Wh210A max

Design a custom pack with this cell:

Pack Planner →Pack Designer →

Application suitability

PowerwallsHigh capacity means more stored energy per cell. Fewer cells needed for a given kWh target.

Ebike PacksGood balance of capacity for range and discharge for hills. Works well in most ebike packs.

Car AudioEnough discharge to handle amplifier bursts without voltage sag.

High-Drain VapingAbove the 25A Mooch CDR threshold. Suitable for regulated and mechanical mods.

FlashlightsDecent runtime. Works well for most flashlights.

Power ToolsSufficient discharge and capacity for most power tool packs.

Similar cells

Same format and chemistry, within ±500mAh capacity:

Cell	mAh	CDR	Wh	Weight	Wh/kg
Efest EFEST 35A 2900mAh (this cell)	2900	35A	10.44	—	—
AWT 40A 3300mAh	3300	40A	11.9	—	—
Efest 18650 2800mAh 35A	2800	35A	10.1	46g	219
AWT 40A 2600mAh	2600	40A	9.4	—	—
AWT YELLOW 40A 2600mAh	2600	40A	9.4	—	—
Golisi S26	2600	25A	9.4	46g	203

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 Efest EFEST 35A 2900mAh?

What is the maximum discharge rate of the Efest EFEST 35A 2900mAh?

How many EFEST 35A 2900mAh cells do I need for a 48V ebike battery?

Can I use the EFEST 35A 2900mAh for vaping?

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.

Get new tools and build tips

We are always adding tools, cell data, and guides. Drop your email for new tool releases and battery-building tips. No spam, unsubscribe anytime.

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.