Hulkman Sigma 5 5A 6V/12V Battery Charger

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Product guide

Hulkman Sigma 5 5A 6V/12V Battery Charger

Battery: The Hulkman Sigma 5 is a 5A charger and maintainer for compatible 6V and 12V lead-acid batteries and 12V LiFePO4 batteries. It requires an external AC outlet, so it is a charger and maintainer rather than a portable jump starter.

At a glance

Offers charging, maintenance, trickle charging and float charging functions for supported battery types.
The LED display is claimed to show battery status, voltage, charging mode and incorrect operations.
Manufacturer describes automatic cutoff after full charge and restart when battery voltage drops.
Loading Mode is claimed to work with batteries as low as 0.3V. Repair Mode is specified for batteries over 2V.

Price

$69.99Save 30%

Reference price: ~~$99.99~~

Price checked: Nov 14, 2026

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Often bought together

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HULKMAN SigmaE01 9.2-Feet (2.8 Meters) Extension Cable for Sigma 1/ Sigma 5 Battery Charger

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Pros and cons

Pros

Supports both 6V and 12V lead-acid batteries, plus 12V LiFePO4 batteries.
The stated 5A output in 12V mode and 1.8A output in 6V mode cover different small-vehicle battery needs.
Display reports charging information and operating errors, according to the listing.
Package listing includes both clamps and eyelets, plus a bracket and screws.

Cons

This is not a jump starter and needs an external AC source to operate.
The 6V output is 1.8A, lower than the 5A output specified for 12V mode.

Technical specifications

15 specifications

Identity
Brand	Hulkman
Model	Sigma 5

Dimensions and installation
Dimensions listed	3.07"D x 5.51"W x 1.89"H
Weight listed	856 g

Charging
Output voltage and current, 12V mode	12V DC, 5A
Output voltage and current, 6V mode	6V DC, 1.8A
Battery capacity range, 12V mode	15-120Ah
Battery capacity range, 6V mode	6-50Ah
Supported battery chemistries	12V / 6V lead-acid and 12V lithium batteries (LiFePO4)
Lead-acid types listed	flooded, gel, maintenance-free, AGM, SLA, and VRLA
Charging stages	9-stage
Display	3.2-inch LED display

Construction and connection
Protection rating claimed	IP67
Cable connector type	Alligator Clamps
Input voltage listed	100-240V AC, 50Hz, 85W

What to know before buying

Listing details to confirm

The listing gives inconsistent 12V capacity ranges: one feature states 15 to 121Ah, while detailed product copy states 15-120Ah. It also describes the warranty as both a 2-Year Hassle Free Warranty and a 3-Year Limited Warranty or 3-year customer service. Confirm the selected listing's capacity range and warranty terms before purchase.

What’s in the box

Included

Battery clamps (1)
Battery eyelets (1)
Mounting screws ×1
Power adapter ×1
User manual ×1

Who is it for?

A good fit for

Owners maintaining compatible car, motorcycle, ATV or other small-vehicle batteries near an AC outlet.
Buyers needing a charger for both 6V and 12V lead-acid batteries, as well as 12V LiFePO4 batteries.
Users who want a screen showing battery status, voltage and charging mode.

Less suited to

Drivers seeking a portable jump starter or a charger that runs without an AC outlet.
Buyers needing higher charging current than the specified 12V 5A or 6V 1.8A outputs.

Hulkman Sigma 5 5A 6V/12V Battery Charger · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 491 ratings

5 stars83%83%
4 stars9%9%
3 stars4%4%
2 stars0%0%
1 star4%4%

Customer feedback highlights perceived build quality, a readable display and versatility, with some customers also describing good value. Reports are mixed on charging time and connectivity. For buyers maintaining small compatible batteries, the screen and multi-chemistry support may be useful, but the listed 5A 12V output is modest and customer feedback includes reports of slow charging.

Positive themes

Customers describe the charger as well-made and its display as easy to read.
Feedback mentions versatility across battery types and perceived value.

Mixed feedback

Feedback on charging time is mixed, with reports that charging can take a long time.
Connectivity receives mixed feedback, though the supplied summary does not specify the issue.

Frequently asked questions

Can the Hulkman Sigma 5 jump-start a vehicle?

No. The listing says it must connect to an external AC source and identifies it as a charger and maintainer, not a car jump starter.

Which batteries does the Sigma 5 support?

The listing specifies 6V and 12V lead-acid batteries and 12V LiFePO4 batteries. It gives a 6-50Ah range for 6V mode and conflicting 15 to 121Ah and 15-120Ah ranges for 12V mode.

What is included in the package?

The explicit contents list names battery clamps, battery eyelets, a bracket, two screws, the Sigma 5 charger, a user manual and warranty wording. A separate feature claim describes 3-year customer service, while the details list a 2-year warranty, so confirm warranty terms.