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Lenovo IdeaPad Slim 3 15ITN9

Ranked #47 of 70 in Most energy-efficient laptops, ranked on official ENERGY STAR power figures. Here is every spec we scored, where it came from, and how it compares.

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L

#47

Lenovo IdeaPad Slim 3 15ITN9

Best for: Official TEC 6.3 kWh, official sleep 0.4 W

9.0/10

What we like

Official ENERGY STAR record lists a TEC of 6.3 kWh.
Official ENERGY STAR record lists sleep-mode power of 0.4 W.

Watch out for

Official TEC is a certified laboratory annual-energy figure for this configuration, not a utility bill we measured.

Score breakdown

Official TEC 45%

Official sleep power 30%

Official short-idle power 25%

Official TEC	6.3 kWh
Official sleep power	0.4 W
Official short-idle power	5.3 W
Official ENERGY STAR unique ID	4,005,512
Official model name	IdeaPad Slim 3 15ITN9
Official model number	IdeaPad Slim 3 15ITN9
Official product type	Notebook
Official TEC	6.3 kWh
Official sleep mode power	0.4 W
Official short-idle power	5.3 W
Official long-idle power	0.4 W
Official off-mode power	0.3 W
Official system memory	16 GB
Official CPU cores	8
Official processor brand	Intel
Official processor name	N355
Official CPU base clock	1.9 GHz
Official storage technology	SDD
Official ENERGY STAR date certified	2025-03-20T00:00:00.000
Official battery capacity	57.5 Wh
Official integrated display size	15.6 in
Official integrated display resolution	2.07 MP
Official touch screen	No
Official 'marketed as a workstation'	No
Official external power supply rating	65 W
Price	Check price

Check price at Amazon

Specs sources:

Lenovo IdeaPad Slim 3 15ITN9 head-to-head

Featured inLaptops with lower official TEC

How it compares

Open the full comparison table

Apple MacBook Neo

#1 · Official TEC 5.6 kWh, official sleep 0.1 W

Microsoft Surface Laptop 13"

#2 · Official TEC 6.3 kWh, official sleep 0.3 W

Apple MacBook Air 13-inch (M2)

#3 · Official TEC 7.6 kWh, official sleep 0.3 W

Apple MacBook Air 13-inch (M3)

#4 · Official TEC 7.6 kWh, official sleep 0.3 W

Microsoft Surface Laptop 13" 2nd Edition

#5 · Official TEC 7.3 kWh, official sleep 0.4 W

Apple MacBook Air 13-inch (M4)

#6 · Official TEC 8.1 kWh, official sleep 0.3 W

ASUS S5452M

#7 · Official TEC 7.1 kWh, official sleep 0.5 W

HP Chromebook Plus 14 inch

#8 · Official TEC 8.1 kWh, official sleep 0.3 W

Lenovo IdeaPad Slim 3 15Q7X11

#9 · Official TEC 7.8 kWh, official sleep 0.4 W

ASUS E1404GA

#10 · Official TEC 8.3 kWh, official sleep 0.3 W

Dell Latitude 3140

#11 · Official TEC 8.2 kWh, official sleep 0.4 W

Lenovo IdeaPad 1 15AMN7

#12 · Official TEC 8.2 kWh, official sleep 0.3 W

#13 · Official TEC 8.3 kWh, official sleep 0.4 W

Microsoft Surface Laptop 8th Edition

#14 · Official TEC 7.7 kWh, official sleep 0.5 W

Apple MacBook Air 13 in. with M5

#15 · Official TEC 8.3 kWh, official sleep 0.2 W

Apple MacBook Pro 14-inch (M5)

#16 · Official TEC 8.5 kWh, official sleep 0.3 W

ASUS E1504T

#17 · Official TEC 8.5 kWh, official sleep 0.3 W

dynabook PORTEGE E30L-Q

#18 · Official TEC 8 kWh, official sleep 0.5 W

Lenovo IdeaPad Slim 3 15IAN8

#19 · Official TEC 8.5 kWh, official sleep 0.3 W

Microsoft Surface Laptop 7th Edition

#20 · Official TEC 7.9 kWh, official sleep 0.5 W

ASUS B3606CMA

#21 · Official TEC 8.3 kWh, official sleep 0.5 W

ASUS E510KA

#22 · Official TEC 9.3 kWh, official sleep 0.3 W

HP Chromebook x360 14 inch

#23 · Official TEC 8.7 kWh, official sleep 0.4 W

Lenovo IdeaPad Slim 3 14Q7X11

#24 · Official TEC 8.2 kWh, official sleep 0.5 W

Lenovo V15 G7 Q7X

#25 · Official TEC 8.2 kWh, official sleep 0.5 W

#26 · Official TEC 8.7 kWh, official sleep 0.4 W

Microsoft Surface Laptop 13" 1st Edition

#27 · Official TEC 8.5 kWh, official sleep 0.5 W

Apple MacBook Air 15-inch (M3)

#28 · Official TEC 8.9 kWh, official sleep 0.3 W

Apple MacBook Air 15-inch (M4)

#29 · Official TEC 9 kWh, official sleep 0.3 W

Apple MacBook Pro 14-inch (M4)

#30 · Official TEC 9 kWh, official sleep 0.3 W

ASUS E1404T

#31 · Official TEC 8.8 kWh, official sleep 0.4 W

Lenovo IdeaPad Slim 5 13ARP10

#32 · Official TEC 8.9 kWh, official sleep 0.4 W

Lenovo IdeaPad Slim 5 Ultra 14IWC11

#33 · Official TEC 8 kWh, official sleep 0.6 W

Acer A315-24P

#34 · Official TEC 9 kWh, official sleep 0.3 W

Apple MacBook Air 15 in. with M5

#35 · Official TEC 9.1 kWh, official sleep 0.2 W

Dell Latitude 3140 2-in-1

#36 · Official TEC 9 kWh, official sleep 0.4 W

Lenovo IdeaPad Slim 5 13IWC11

#37 · Official TEC 8.6 kWh, official sleep 0.6 W

Microsoft Surface Laptop 6

#38 · Official TEC 8.9 kWh, official sleep 0.5 W

Apple MacBook Pro 14 in. with M5 Max Chip

#39 · Official TEC 9.2 kWh, official sleep 0.3 W

Apple MacBook Pro 14 in. with M5 Pro Chip

#40 · Official TEC 9.5 kWh, official sleep 0.3 W

Apple MacBook Pro 14-inch (M4 Pro)

#41 · Official TEC 9.4 kWh, official sleep 0.3 W

dynabook PORTEGE X30W-P

#42 · Official TEC 9 kWh, official sleep 0.6 W

HP OmniBook 5 14 inch Laptop AI PC

#43 · Official TEC 9.2 kWh, official sleep 0.5 W

HP ProBook 4 G2iS 14

#44 · Official TEC 9.2 kWh, official sleep 0.4 W

Lenovo IdeaPad Slim 3 14IPH11

#45 · Official TEC 9.3 kWh, official sleep 0.5 W

Lenovo IdeaPad Slim 3 14IWC11

#46 · Official TEC 9.1 kWh, official sleep 0.5 W

Lenovo IP Slim 3 Chrome 14M868

#48 · Official TEC 9.4 kWh, official sleep 0.5 W

Lenovo ThinkBook 14 G9 Q8Y

#49 · Official TEC 9 kWh, official sleep 0.5 W

Lenovo ThinkPad E14 Gen 8

#50 · Official TEC 8.9 kWh, official sleep 0.6 W

Lenovo IdeaPad Vibe 14AKP12

#51 · Official TEC 9.4 kWh, official sleep 0.4 W

Lenovo ThinkPad X12 Detachable Gen 2

#52 · Official TEC 9.1 kWh, official sleep 0.5 W

Lenovo V14 G6 AMN

#53 · Official TEC 9.3 kWh, official sleep 0.6 W

#54 · Official TEC 9.4 kWh, official sleep 0.6 W

ASUS M1405N

#55 · Official TEC 9.4 kWh, official sleep 0.5 W

HP OmniBook X Flip 16 inch 2-in-1 Laptop Next Gen AI PC

#56 · Official TEC 9.4 kWh, official sleep 0.5 W

Lenovo ThinkBook 16 G9 IPL

#57 · Official TEC 9 kWh, official sleep 0.7 W

ASUS X1404M

#58 · Official TEC 9.4 kWh, official sleep 0.6 W

dynabook PORTEGE E40L-Q

#59 · Official TEC 9.9 kWh, official sleep 0.5 W

Acer AL15-58P

#60 · Official TEC 10 kWh, official sleep 0.6 W

Dell Pro 5 14 P514260

#61 · Official TEC 9.2 kWh, official sleep 0.8 W

dynabook PORTEGE X30L-P

#62 · Official TEC 9.9 kWh, official sleep 0.6 W

Acer A317-55P

#63 · Official TEC 10.7 kWh, official sleep 0.4 W

Acer One Z11-21

#64 · Official TEC 10.7 kWh, official sleep 0.5 W

Dell Pro Essential 15 PV15261

#65 · Official TEC 10.7 kWh, official sleep 0.7 W

#66 · Official TEC 11.6 kWh, official sleep 0.7 W

MSI Modern 14 F1MG

#67 · Official TEC 14.2 kWh, official sleep 0.9 W

MSI Modern 13 F1MG

#68 · Official TEC 14.7 kWh, official sleep 0.9 W

MSI Modern 15 F1MG

#69 · Official TEC 15.7 kWh, official sleep 0.9 W

MSI Modern A14 AI F2HMG

#70 · Official TEC 17.5 kWh, official sleep 1.3 W