Rank #4 in Best Car Battery Charger 2026: 10 Ranked, and Two Share a Model Number
NOCO GENIUS2 2A 6V/12V Smart Battery Charger & Maintainer
Price and rating as shown on Amazon when we collected them. Both change.
The NOCO GENIUS2 is a 2-amp smart charger, maintainer and desulfator for 6-volt and 12-volt lead-acid and lithium batteries, priced at £53.34 and rated 4.5 out of 5 from 2,293 ratings. It takes number 4 in this guide. The listing positions it as an all-in-one: charger, battery maintainer, trickle charger and desulfator, with an integrated thermal sensor that adjusts the charge to the ambient temperature so it can be left connected indefinitely.
Two numbers on its own listing do not line up. The title and the bullets describe a 6V/12V unit, while the spec table gives 'Output Voltage: 12 Volts' and nothing else — so anyone buying this to charge a 6-volt battery is working from the headline, not the table. The same table claims a 'Battery Charge Time: 1 Hours' from a 2-amp output, which is a fast figure for a 2-amp charger on a car battery. For context, the two 25-amp chargers covered elsewhere in this guide are listed at £59.99, £6.65 more than this one. Everything on this page comes from the Amazon listing, not from testing of our own.
How those 2,293 ratings break down
An average hides its own shape. This is the spread behind the 4.5 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £53.34 |
|---|---|
| Rating | 4.5 out of 5 from 2,293 ratings |
| Output current | 2 Amps (Current Rating and Amperage, as listed) |
| Output voltage | 12 Volts (as listed — the product title says 6V and 12V) |
| Battery charge time | 1 Hours (as listed) |
| Input voltage | 240 Volts |
| Histogram | 75 of 100 ratings are 5-star |
| Weight | 560 g |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“Having been left for 6 hours waiting on a breakdown service, with a child in the car, which when he arrived, it took him all of 10 seconds to use a battery charger to provide enough power to restart my car, I felt it would be a good investment to carry my own charger as a safety measure and provide peace of mind.I haven't used it as yet, but it is very compact and the instructions are very straightforward.To be honest, I hope I don't have to use it but will feel much safer having it in my boot.......just in case!”
Verified purchase“Perfect for my 1300cc motorcycle. Also brought my diesel van battery back to life👍”
What it is up against
The rivals it was ranked against in Best Car Battery Charger 2026: 10 Ranked, and Two Share a Model Number.
Questions people ask
What batteries can the NOCO GENIUS2 charge?
The listing says 6-volt and 12-volt lead-acid batteries (AGM, EFB, Gel, SLA, VRLA, Start-Stop) and lithium-ion (LiFePO4) batteries, including flooded, maintenance-free, deep-cycle, marine and powersport batteries.
Can the NOCO GENIUS2 charge a completely flat battery?
The listing says it charges batteries from as low as 1 volt, and that Force Mode lets you manually charge completely dead batteries down to zero volts.
What is the charge current of the NOCO GENIUS2?
2 amps. The spec table gives 'Current Rating: 2 Amps' and 'Amperage: 2 Amps'.
Does the NOCO GENIUS2 output 6 volts as well as 12 volts?
The title and bullets say 6V and 12V, but the spec table lists only 'Output Voltage: 12 Volts'. That is the contradiction to check before buying for a 6-volt battery.
What is in the box with the NOCO GENIUS2?
The GENIUS2UK 2A smart battery charger and maintainer, needle-nose battery clamps with integrated eyelet terminals, a mounting bracket with Velcro strap, two black truss-head screws, the user guide and a 3-year limited warranty, as listed.
What does the NOCO GENIUS2 cost and how is it rated?
It is listed at £53.34 and rated 4.5 out of 5 from 2,293 ratings, with 75 of the 100 ratings on the histogram at 5 stars.
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