Rank #7 in Best Car Battery Charger 2026: 10 Ranked, and Two Share a Model Number
NOCO GENIUS2X4 8A 4-Bank Smart Battery Charger
Price and rating as shown on Amazon when we collected them. Both change.
No other pick in this guide charges four batteries at once, and no other pick costs £165.00. The NOCO GENIUS2X4 is a four-bank charger: one unit, four outputs, four sets of cables and four pairs of needle-nose clamps, priced at £165.00 with a 4.7 rating from 1,754 ratings. It sits at #7 here, which is where a charger that does four batteries at once tends to land when most buyers only need to keep one topped up.
The number worth checking is the one in the name. The 8A in the title is total output across four banks, not per battery — the same title says "2A/Bank", so each battery on this unit receives a quarter of what the headline figure suggests, and the listing's own reviews describe the charge as gentle. That is not automatically a fault for a maintainer designed to be left connected, but it is a real difference from the single-output chargers ranked above it. Two other entries in the same spec panel are harder to square: "Battery Charge Time: 1 Hours" is listed with no battery capacity attached to it, and "Connector Types: USB" sits alongside box contents that mention only charging cables and needle-nose battery clamps. Everything on this page comes from the Amazon listing, not from testing we have carried out.
How those 1,754 ratings break down
An average hides its own shape. This is the spread behind the 4.7 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £165.00 |
|---|---|
| Amazon rating | 4.7 out of 5, from 1,754 ratings |
| Output | 8 Amps total across 4 banks (2 Amps per bank, as listed) |
| Banks / ports | 4 |
| Battery charge time (as listed) | 1 Hours |
| Connector types (as listed) | USB |
| Input voltage | 240 Volts |
| Item weight | 3.53 kg |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“This comes with four extension leads and four sets of crocodile clips to attach to batteries. I would have like some fly leads to attach permanently to the bikes but they're not supplied and I ordered them separately.I attached this to the wall of the garage, attached it to two batteries in bikes and two that I had lying around. It charged the bikes up quickly and brought one of the flat batteries back to life but I guess that the other was too far gone. If you have a few bikes or want to maintain several batteries over the winter this is perfect and way better than having separate chargers.”
Verified purchase“The way that this charger is boxed and packaged is unbelievable. I just can't bring myself to throw out the packaging. Yes! It is very expensive for a battery charger, but, what a beautiful piece of equipment. I connected it to four 12v 50ah batteries and it charged the lot. Then I put four 100ah leisure batteries on it and it charged them as well. It gives such a gentle charge and treats each battery as an individual. Brilliant.”
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
Is the NOCO GENIUS2X4 an 8-amp charger?
The listing headline says 8A, and the same title qualifies it as 2A per bank. Four batteries therefore share that 8 amps rather than each receiving it.
What batteries will it charge?
The listing covers 6-volt and 12-volt lead-acid batteries (AGM, EFB, Gel, SLA, VRLA, Start-Stop) and lithium-ion LiFePO4, including flooded, maintenance-free, deep-cycle, marine and powersport batteries.
Can it charge a completely flat battery?
The listing says the NOCO GENIUS2X4 charges batteries from as low as 1 volt, and that Force Mode is for manually charging completely dead batteries down to zero volts.
Does it charge four batteries in one hour?
The spec panel lists "Battery Charge Time: 1 Hours". The listing gives no battery capacity alongside that figure, so it does not say what size of battery the hour refers to.
The title mentions 6V, but the spec table says Output Voltage is 12 Volts. Which is it?
The headline and the compatibility list both cover 6-volt and 12-volt batteries, while the spec table lists only "Output Voltage: 12 Volts". The listing leaves that difference unexplained.
Can I leave batteries connected to it?
Yes. The listing states the charger monitors the battery constantly and can be left connected indefinitely for maintenance without overcharging.
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