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CTEK NXT 5 12V Smart Battery Charger and Maintainer, 4.3 A, for Lead-Acid, AGM and LiFePO4 Batteries
4.3 A, 12 V, 1.2–160 Ah Lead-acid, AGM and LiFePO4

Official product photos: CTEK · source More photos on Amazon

Best battery maintainer CTEK · Car Care

CTEK NXT 5 12V Smart Battery Charger and Maintainer, 4.3 A, for Lead-Acid, AGM and LiFePO4 Batteries

Connect it and forget it: keeps a stored car, classic or motorcycle battery healthy for months, even lithium.

RightScore Score pending
Best for Car care Cold weather DIY projects

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  • 4.3 A, 12 V, 1.2–160 Ah
  • Lead-acid, AGM and LiFePO4
  • IP65, 5-year warranty

At a glance

Our verdict

—

For any vehicle that is not driven daily, a quality maintainer is cheap insurance against dead batteries and early replacement, and CTEK's 5-year warranty is reassuring. The trade-offs: at 4.3 A it recharges a deeply flat large ba...

RightScore appears once live prices from licensed store feeds are connected — we never guess a number.

Read the full verdict

1.2–160 Ah

Battery capacity

1.32 lb

Weight

Best for

  • Car care
  • Cold weather
  • DIY projects

Best thing: Supports LiFePO4 as well as lead-acid

Honest catch: Slow to recharge a large, deeply flat battery

Our verdict

For any vehicle that is not driven daily, a quality maintainer is cheap insurance against dead batteries and early replacement, and CTEK's 5-year warranty is reassuring. The trade-offs: at 4.3 A it recharges a deeply flat large battery slowly, and it costs more than basic trickle chargers.
RightDeals research · checked 11 Oct 2026
A car that sits for weeks — a weekend car, a classic, a motorcycle over winter — slowly drains its battery until it will not start. CTEK's NXT 5 is a fully automatic, connect-and-forget 12 V charger and maintainer, delivering up to 4.3 A for batteries from 1.2 to 160 Ah. It handles flooded, maintenance-free, Ca/Ca, AGM, EFB, GEL and LiFePO4 batteries, with patented desulphation and reconditioning modes, an AGM mode for Start/Stop batteries and automatic temperature compensation. The unit is IP65-rated, works from -4°F to 122°F, weighs 1.32 lb and comes with a U-terminal for a permanent connection.

Why you’ll like it

  1. 01

    No more dead batteries: leave it connected all season and it keeps the battery topped up automatically.

  2. 02

    One charger for every vehicle: works with lead-acid types, AGM/EFB Start/Stop batteries and LiFePO4.

  3. 03

    Can revive tired batteries: desulphation and reconditioning modes help restore capacity.

  4. 04

    Built for garages and sheds: IP65-rated and usable from -4°F to 122°F, with flexible rubber cables.

Great for

  • Owners of classic, weekend or seasonal cars
  • Motorcycle and powersport owners
  • Anyone who leaves a car parked for weeks

Maybe skip it if

  • You need to jump-start a car right now — get a jump starter
  • You only have 6 V batteries

Where it shines

How well it suits each use, based on its specifications.

  • Car care Great
  • Cold weather Great
  • DIY projects Good
  • Emergencies OK

Pros & cons

Pros

  • Supports LiFePO4 as well as lead-acid
  • Fully automatic connect-and-forget operation
  • IP65 weather resistance
  • Long 5-year warranty

Cons

  • Slow to recharge a large, deeply flat battery
  • Costs more than basic trickle chargers

Based on the maker’s specifications and published information — every point is checked against a named source.

Where to buy

Stores we link to in US. We show a price only when it is live.

Prices for United States in USD
Amazon

Amazon

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We may earn a commission when you buy through our links. It never changes how we rank products. How we make money

More stores and live prices are added automatically as we connect store feeds.

Specifications

Battery

Battery capacity
1.2–160 Ah
Battery types
WET, MF, Ca/Ca, AGM, EFB, GEL, LiFePO4

Design

Ingress protection
IP65
Operating temperature
-4°F to 122°F

Features

Modes
Desulphation, reconditioning, AGM; temperature compensation

Performance

Minimum start voltage
2 V

Size & weight

Weight
1.32 lb

Power

Charging current
4.3 A
Battery voltage
12 V
Input
110–120 VAC, 50–60 Hz

Source: RightDeals research · verified 2026-10-11

Our score is on its way

We publish it only once enough real data is in — see how we rank products.

How We Rank Products

What buyers say

We only show star ratings we are licensed to display. Read verified buyer reviews and photos directly on Amazon.

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Questions people ask

Can I leave it connected all winter?

Yes. CTEK designs it as a fully automatic "connect-and-forget" charger that maintains the battery, and a U-terminal is included for a permanent connection.

Does it charge lithium batteries?

CTEK lists 12 V LiFePO4 (lithium iron phosphate) among the supported battery types, alongside lead-acid, AGM, EFB and GEL.

Sources & method

Researched from the maker’s specifications, the store listing and published information — not lab-tested. We never accept payment for a recommendation.

How We Rank Products · Editorial policy

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