Battery Equivalents and Replacements

Imazing IM39 Portable Car Jump Starter

Imazing IM39 Portable Car Jump Starter is a versatile device primarily intended as a portable car jump starter, but it can also be used as a portable power bank and an emergency flashlight.

As a portable car jump starter, Imazing IM39 is safe and easy to use - despite its compact size, it is able to crank large diesel engines up to 10 liters and even larger gasoline engines.

Published: May 27, 2022.

imazing im39 1

Imazing IM39 Portable Car Jump Starter Features and Specifications

Imazing IM39 Portable Car Jump Starter comes with ~99 Wh (3.7V 26800 mA) lithium battery which can ensure, in theory, 30-40 start attempts.

In real life, a number of start attempts depends on the engine size, type, outside temperature, vehicle's battery condition, etc. - Imazing IM39 comes with a very respectful battery and energy-efficient electronics, ensuring 10+ starts/cranks on a single battery charge.

The unit features physical dimensions of 9.65 x 3.86 x 1.81 inches (~245 x 98 x 46 mm) and weighs 3.25 pounds (~1.47 kg) - unit is compact and lightweight enough to be easily carried in a backpack, for example.


Imazing IM39 features several ports, including:

- USB Type-C 3A Input/Output port,

- USB1: 5V/3A, 9V/2A, 12V/1.5A,

- USB2: 5V/2.1A,

- DC: 12V/12A,

- 12V Smart Clamps port.

The unit is recharged via USB Type-C 3A Input/Output port (cable comes with a unit) and when the battery is fully discharged, it takes up to 12-13 hours to fully recharge the battery again.

Note: thanks to the large battery, Imazing IM39 can be used as an excellent portable power bank - it can recharge smartphones, tablets, and other devices. But, if the battery is discharged below a certain level, the unit can't be used to successfully crank the engine, which is its original purpose.

The additional feature of the Imazing IM39 is the LED flashlight which features three light modes - Light, Strobe, and SOS. The light can come in handy in many situations, especially when starting the car in low light conditions.

How to Start the Engine Using Imazing IM39?

Imazing IM39 is a very simple to use portable car battery charger that comes with numerous safety features, including reverse polarity, reverse connection, over-current, overload, over-voltage, over-charge, over-discharge, and short circuit.

However, when the unit arrives, be sure to read the manual and to keep the manual in the unit's carrying case.

The actual procedure is very simple:

- turn On the Imazing IM39,

- Insert the starting cable in the unit,

- Connect the clamps to the battery,

- Start the car.

And that's it - remove the cables and recharge the unit right away.

Despite having so many safety features, don't let the clamps touch each other, just in case.

What's In The Box?

whats in the box

When the Imazing IM39 car jump starter arrives, the box contains:

- 1x Imazing IM39 Jump Starter,

- 1x Carry Case,

- 1x Smart Clamps Cable,

- 1x Type C Cable (Charging Cable)

- 1x Cigarette Lighter Female Adapter,

- 1x User Manual.

Also, the Imazing IM39 car jump starter comes with a 2-year limited warranty.

Imazing Portable Car Jump Starters

Imazing offers several similar car jump starters - they are all rather easy and safe to use, but they also differ in battery size and maximum current that they support.

The following comparison chart lists a few Imazing car jump starters with their most important features and specifications:

Model Imazing IM27 Imazing IM29 Imazing IM31 Imazing IM39
 Photo imazing im27 table  imazing im29 table  imazing im31 table  imazing im39 m
Starting Current 800 Amps 1000 Amps 1100 Amps -
Peak Current 2000 Amps 2500 Amps 2500 Amps 4000 Amps
Recommended For Gas 8.0 liters
Diesel 7.5 liters
Gas 8.0 liters
Diesel 8.0 liters 
Gas 10.0 liters
Diesel 10.0 liters 
Gas 10.0+ liters
Diesel 10.0 liters
Battery 66.6 Wh 74 Wh 77.7 Wh 99 Wh
Number of Starts 10+ 10+ 10+ 10+
Input USB Type-C 3A
USB Type-C 3A
DC: 18V/10A USB Type-C 3A
Output USB1: 5V/3A, 9V/2A, 12V/1.5A,
USB2: 5V/2.1A,
DC: 12V/10A
USB1: 5V/3A, 9V/2A, 12V/1.5A,
USB2: 5V/2.1A,
DC: 12V/10A 
USB1: 5V/3A, 9V/2A, 12V/1.5A,
USB2: 5V/2.1A,
DC: 12V/10A
DC: 110V/60Hz/100W
USB1: 5V/3A, 9V/2A, 12V/1.5A,
USB2: 5V/2.1A,
DC: 12V/12A
Charging USB Cable USB Cable Car Charger, Wall Charger USB Cable
Charging Time 4.5 hours 6 hours 6 hours 12 hours
Additional Features LED Flashlight
(Light, Strobe, SOS)
LED Flashlight
(Light, Strobe, SOS) 
LED Flashlight
(Light, Strobe, SOS)
Power Inverter
(110V, 60 Hz, 100W)
LED Flashlight
(Light, Strobe, SOS)
Dimensions 7.5 x 3.5 x 1.4 inches
191 x 88 x 36 mm
7.72 x 3.42 x 1.58 inches
196 x 87 x 40 mm 
9.05 x 4.80 x 1.65 inches
230 x 122 x 42 mm 
9.65 x 3.86 x 1.81 inches
245 x 98 x 46 mm
Weight 1.14 pounds
518 grams
1.42 pounds
644 grams
1.95 pounds
882 grams
3.25 pounds
1.47 kg
Operating Temperature -20°C to +60°C -20°C to +60°C  -40°C to +80°C  -
Charging Temperature 0°C to + 60°C 0°C to + 60°C 0°C to + 60°C -
Recommended Charging Temperature* Room Temperature Room Temperature Room Temperature Room Temperature
Amazon Link Imazing IM27 Imazing IM29 Imazing IM31 Imazing IM39

Note: Amazon links ("Model" column) open in the new window, feel free to check them for the most up-to-date offers and prices.

Note "*":  Lithium-ion batteries perform best at room temperature - if possible, charge ALL devices with lithium-ion batteries at room temperatures (15°C to 30°C) and keep them away from the sunlight!

Imazing IM39 costs more than some smaller and weaker units, but it also can crank surprisingly large engines.

Long Story Short: If You are looking for a versatile unit, but primarily intended as a car jump starter, consider Imazing IM39 - it features a peak current of 4000(!) Amps, ~99Wh battery, numerous safety features, and in the end, it gets its job done.

imazing im39 mAlso, Imazing IM39 can be used as a power bank and as a flashlight - a LED flashlight allows the user to crank the engine even during the night.

However, using this and similar units as portable power banks can be a double-edged sword - personally, use it to charge only telecommunication devices to make emergency calls and nothing more. And as soon as the engine starts, recharge it.

For more reviews and recommendations, feel free to check the Imazing IM39 Portable Car Jump Starter Amazon link (link opens in the new window).