# NOCO GENIUS5 5A 6V/12V Smart Battery Charger & Maintainer

Source: https://www.ranked10.co.uk/tech/best-car-battery-chargers/noco-genius5-charger
Ranked #2 in "Best Car Battery Charger 2026: 10 Ranked, and Two Share a Model Number": https://www.ranked10.co.uk/tech/best-car-battery-chargers

- Price: £73.99 (checked on Amazon UK on 2026-09-17)
- Amazon rating: 4.6 from 3,510 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0828HLDZC?tag=ranked10-21

Position two in this guide, the NOCO GENIUS5 is a 5-amp smart charger that the listing also calls a maintainer, trickle charger and desulfator for 6-volt and 12-volt lead-acid and lithium batteries. It is listed at £73.99, with 4.6 out of 5 from 3,510 ratings.

The numbers inside its own listing do not line up quite as neatly as the headline does. The title and the bullets say 6-volt and 12-volt, but the spec table gives Output Voltage as "12 Volts (DC)" and never mentions 6 volts. Two separate fields, Current Rating and Amperage, both say 5 Amps, so at least those agree with each other. The table also lists "Battery Charge Time: 1 Hours", with no battery size attached to that hour, so it is worth checking what it refers to before you rely on it. Input Voltage reads 240 Volts, which is consistent with a unit that runs from the mains. Everything on this page comes from the Amazon listing, not from testing by us.

## Specification

| Field | Value |
|---|---|
| Price | £73.99 |
| Rating | 4.6 out of 5, from 3,510 ratings |
| Current Rating | 5 Amps |
| Amperage (as listed) | 5 Amps |
| Output Voltage | 12 Volts (DC) |
| Input Voltage | 240 Volts |
| Battery Charge Time (as listed) | 1 Hours |
| Item Weight | 720 g |

## Questions people ask

**What batteries can the NOCO GENIUS5 charge?**

The listing says it is designed for 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 GENIUS5 charge a completely flat battery?**

The listing says it can charge batteries from as low as 1 volt, and that Force Mode lets you manually charge completely dead batteries down to zero volts.

**Does the spec table confirm 6-volt output?**

No. The title and bullets say 6-volt and 12-volt, but the spec table lists Output Voltage as 12 Volts (DC) only. Current Rating and Amperage both read 5 Amps, and Input Voltage is listed as 240 Volts.

**How much does the NOCO GENIUS5 cost?**

£73.99, as listed, with 4.6 out of 5 from 3,510 ratings.

**Can I leave the NOCO GENIUS5 connected?**

The listing says the charger constantly monitors the battery and that you can leave it connected indefinitely for maintenance without overcharging.

**What is in the box with the NOCO GENIUS5UK?**

The listing lists the GENIUS5UK 5A charger and maintainer, needle-nose battery clamps with integrated eyelet terminals, a mounting bracket with velcro strap, two black truss-head screws and a user guide, plus a 3-year limited warranty.