A well equipped maintainer for keeping several kinds of stored batteries healthy, with features usually found on dearer units.
Amazon $46.42
A weatherproof maintainer for motorcycles, ATVs and cars in storage that also handles lithium batteries. Owners of big truck or RV batteries should step up to a GENIUS5 or GENIUS10.
- 2 ACharge current
- 6/12 VVoltage
- YesLithium mode
- 3 yearsWarranty
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
- IP65 housing and a mounting bracket let it live permanently in a shed, boat or trailer
- Lithium and AGM modes cover most powersport and car batteries
- Force Mode recovers batteries drained below 1 V
- Twice the current of the GENIUS1 for a modest price step
- 2 A still takes a full day or more to refill a flat car battery
- Rated to charge batteries only up to 40 Ah; larger ones are maintained, not charged quickly
The NOCO GENIUS family
Every NOCO GENIUS model we rank, smallest first. Ratings compare each against its own current.
| Model | Charge current | Rating | Price |
|---|---|---|---|
| NOCO GENIUS1 | 1 A | 2.9/5 | $29.95 |
| NOCO GENIUS2 (this one) | 2 A | 3.2/5 | $49.95 |
| NOCO GENIUS5 | 5 A | 4.1/5 | $69.95 |
| NOCO GENIUS10 | 10 A | 3.5/5 | $99.87 |
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its current. How we rank explains each one.
Specifications
| Model number | GENIUS2 |
|---|---|
| Charging | |
| Charge current | 2 A |
| Voltage | 6/12 V |
| Largest battery | 40 Ah |
| Lithium mode | Yes |
| AGM mode | Yes |
| Temperature compensation | Yes |
| Repair mode | Yes |
| Power supply mode | No |
| Build | |
| Ingress rating | IP65 |
| Weight | 1.1 lb |
| Warranty | 3 years |
| Released | 2019-11-08 |
Alternatives in this current
A versatile maintainer for garages with a mix of 6 V classics, 12 V cars and lithium powersport batteries.
Amazon $69.95A budget 12 V maintainer for owners with a mix of lead acid and lithium batteries. It suits storage duty more than fast recharging.
Amazon $44.32Compare
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