Head-to-head · Best Car Battery Chargers

Battery Tender Junior vs CTEK MXS 5.0

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

CTEK MXS 5.0 comes out ahead by a narrow margin (4.0 vs 4.3). The gap is mostly about Car enthusiasts and long-term vehicle storage users — read the strengths below before deciding.

Ranked #4 in Best Car Battery Chargers

Battery Tender Junior

4.0

$37.95as of Jun 7

The Battery Tender Junior 800 is a straightforward, reliable battery maintainer designed for long-term storage and maintenance. Reviewers praised its durability and versatility across multiple battery types, with one reviewer noting it has served continuously for years in a shop environment. While it charges slowly and has short leads, its build quality and automatic operation make it a solid choice for those seeking a no-fuss battery maintainer. Car and Driver recommended it as the best option for powersports, while Hank OHop called it a worthwhile investment over cheaper alternatives.

Strengths

— Simple and automatic operation with LED charge indicators
— Works with multiple battery types including AGM, flooded, gel, and lithium
— Durable build quality with inline fuse and reverse polarity protection

Watch-outs

— Slow charging speed at 800mA
— Relatively short 12-foot leads

$37.95 · Check Price on Amazon Full review →

Higher ratedRanked #3 in Best Car Battery Chargers

CTEK MXS 5.0

4.3

$100as of May 28

The CTEK MXS 5.0 is a smart 12V battery charger designed for lead-acid batteries with support for multiple battery types including AGM, GEL, EFB, MF, and CA/CA. Reviewers noted its 8-step automatic charging process that includes desulphation, reconditioning, and maintenance modes. The device is praised for its ease of use and ability to connect and forget, allowing long-term battery connection without damage. However, it's a European model with Schuko plug, making it incompatible with standard US 120V outlets without adapter. It's recommended for car enthusiasts and those storing vehicles for extended periods.

Strengths

— Automatically runs through 8-step charging program including desulphation and reconditioning
— Supports multiple battery types including AGM, GEL, EFB, MF, CA/CA, and wet batteries
— Features maintenance charging mode that allows long-term connection without battery damage

Watch-outs

— European model with Schuko plug, not directly compatible with US 120V outlets
— Higher price point compared to basic battery chargers

$100 · Check Price on Amazon Full review →

How they stack up

Battery Tender Junior

The budget maintainer at $39 — far cheaper than the NOCO Genius 5 or CTEK MXS 5.0, but its 0.75A output is trickle-maintenance only, not fast charging like the NOCO Genius 10.

CTEK MXS 5.0

A premium 4.3A maintainer with an 8-step cycle and reconditioning mode; priced near the NOCO Genius 10 but at lower amperage, trading raw speed for CTEK's refined charging algorithm.

Specs side-by-side

Spec	Battery Tender Junior	CTEK MXS 5.0
Voltage	12V	—
Output Current	800mA	—
Battery Type	AGM, flooded, gel, lithium	—
Charging Stages	Not explicitly stated	—
Protection	Fuse, reverse polarity	—
Input Voltage	120V AC	230V AC
Output Voltage	—	12V DC
Max Charging Current	—	5A
Battery Compatibility	—	AGM, GEL, EFB, MF, CA/CA, Wet
IP Rating	—	IP65
Cable Length	—	Mains: 140cm, Output: 108cm
Weight	—	200g

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