NOCO GENIUS2D 2A Onboard Battery Charger
- 2 A, 12 volt direct-mount onboard charger
- Lead-acid up to 40 Ah: wet, gel, AGM and SLA
- Force Mode for batteries down to zero volts
- 120 volt input, 24 inch cables with eyelet terminals
- 40 hour listed charge time
- Mounting bracket and screws included
- 11.68 ounces, 3.47 x 3.43 x 6.5 inches
- 3 year limited warranty
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A small onboard charger and maintainer for lead-acid batteries up to the stated capacity, mounted under the hood. The low current means long charge times on larger batteries.
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ASIN: B07W3QSMF9Model: GENIUS2DCategory: Car Battery Chargers
Overview
NOCO designs this direct-mount charger to live under the hood, wired to the battery through integrated eyelet terminals. It charges, maintains, trickle charges and desulfates lead-acid batteries.
Permanent mounting makes upkeep a plug-in job, and temperature compensation, desulfation and Force Mode add recovery options. The limitation is the low current, which is built for maintenance and smaller batteries.
Who it's for
People who store vehicles for weeks and want a charger mounted and ready can leave it connected for upkeep. Owners of batteries above the stated capacity, or who need quick charging, should choose a higher-output model.
Pros and cons
- Direct-mount design for under the hood
- Temperature compensation listed
- Force Mode for dead batteries
- Desulfator and overcharge protection
- Low current means long charges
- Lead-acid chemistries only
- Battery size capped at the stated capacity
Performance notes
At low current the charger refills a battery slowly, which suits maintenance and small batteries. Temperature compensation adjusts the charge to ambient heat or cold to protect against overcharge, and pulse charging works against sulfation. Force Mode lets a very discharged battery be charged manually.
Specifications
| Brand | Noco |
|---|---|
| Model | GENIUS2D |
| Dimensions & fit | |
| Item weight | 11.68 ounces |
| Item Dimensions D x W x H | 3.47 x 3.43 x 6.5 inches |
| Capacity & performance | |
| Output Voltage | 12 volts |
| Battery capacity | Up to 40 amp-hours (lead-acid) |
| Power & efficiency | |
| Amperage | 2 A |
| Battery Charge Time | 40 hours |
| Input Voltage | 120 volts |
| Compatibility & installation | |
| Compatible Devices | Cars, boats, ATVs, RVs, trucks, SUVs, lawn mowers, tractors and more |
| Warranty & support | |
| Warranty Description | 3-Year Limited Warranty |
| Other details | |
| Connector Type Used on Cable | Eyelet terminals |
| Specification Met | CEC, FCC, UL |
Closest rivals on specs
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Battery Tender 800 Battery Charger- Amperage 2 vs 0.8 amps (+150%)
- Input Voltage 120 vs 100 volts (+20%)
Frequently asked questions
How do I keep the NOCO GENIUS2D connected long term?
The description says its monitoring system keeps the battery charged without overcharging. Follow the user guide for the connection steps.
Does the NOCO GENIUS2D charge lithium batteries?
No. The title names lead-acid types only: wet, gel, AGM and SLA.
Is the NOCO GENIUS2D a portable charger with clamps?
No. It is a direct-mount onboard unit that connects through eyelet terminals.