Battery Building ToolsCell Database IMREN 25A 3750mAh

✱ Render

21.5 × 70.6 mm · 73.4 g

21700LMO Mooch-tested · 25 A

Imren IMREN 25A 3750mAh

Name: Imren IMREN 25A 3750mAh Lithium Battery Cell
Brand: Imren

Imren · released 2018

Capacity3750 mAh13.5 Wh · 183.92 Wh/kg

Mooch continuous25 ASize to this figure

Voltage window3.6 V2.5 – 4.2 V

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

At 3750 mAh, this ranks #64 of 72 21700 cells in our database. On the lower end for capacity among 21700 cells. A mid-range 21700 cell. Solid for builds that don't need extreme capacity or discharge.

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	25A (Mooch-tested)
Mooch CDR (trusted)	25 A
Physical
Form factor	21700
Dimensions	21.5mm × 70.6mm
Weight	73.4 g
Top type	Flat Top
Protected	No
Wrap color	Gold
Performance
Capacity	3750 mAh
Energy	13.5 Wh
Specific energy	183.92 Wh/kg
Energy density	526.7 Wh/L
Power density (gravimetric)	1,226 W/kg
Power density (volumetric)	3,511 W/L
Year released	2018
Operating Limits
Charge temp	0°C to 45°C
Discharge temp	-20°C to 60°C

Independent test data: Mooch's test of the IMREN 25A 3750mAh ↗

Voltage operating window

Cutoff
2.5VNominal
3.6VMax charge
4.2V

Usable range: 1.7V

C-rate conversion: Imren IMREN 25A 3750mAh (3750mAh)

C-Rate	Current (A)	Theoretical runtime
0.2C	0.75 A	5h 00m
0.5C	1.88 A	2h 00m
1C	3.75 A	1h 00m
2C	7.5 A	30m
3C	11.25 A	20m
5C	18.75 A	12m

Highlighted row is closest to the rated 25A continuous discharge.

Charging

Rate	Current	Estimated time
0.5C	1,875 mA	~2h 00m
1C	3,750 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	3,750 mAh	13.5 Wh	25 A
2P	7,500 mAh	27 Wh	50 A
3P	11,250 mAh	40.5 Wh	75 A
4P	15,000 mAh	54 Wh	100 A
5P	18,750 mAh	67.5 Wh	125 A
6P	22,500 mAh	81 Wh	150 A

Example pack configurations

7S2P

24V ebike / small pack

14 cells25.2V nominal7,500mAh189Wh50A maxCell weight: 1.03 kg (add ~15% for wiring and BMS)

13S4P

48V ebike standard

52 cells46.8V nominal15,000mAh702Wh100A maxCell weight: 3.82 kg (add ~15% for wiring and BMS)

16S4P

DIY powerwall

64 cells57.6V nominal15,000mAh864Wh100A maxCell weight: 4.7 kg (add ~15% for wiring and BMS)

4S6P

Power tool replacement

24 cells14.4V nominal22,500mAh324Wh150A maxCell weight: 1.76 kg (add ~15% for wiring and BMS)

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.

FlashlightsHigh capacity means long runtime. Great for everyday carry and extended use.

Power ToolsSufficient discharge and capacity for most power tool packs.

Physical dimensions

Dimensions21.5mm × 70.6mm

TopFlat Top

Format21700

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 Imren IMREN 25A 3750mAh?

What is the maximum discharge rate of the Imren IMREN 25A 3750mAh?

How many IMREN 25A 3750mAh cells do I need for a 48V ebike battery?

What does the Imren IMREN 25A 3750mAh weigh?

Can I use the IMREN 25A 3750mAh for vaping?

What temperature range can the IMREN 25A 3750mAh operate in?

What size is the Imren IMREN 25A 3750mAh?

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.