NOCO GENIUS2
#9 in Up to 5 AFull review
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.
Amazon $49.95$49.95
The NOCO GENIUS2 is the better battery charger overall, rated 3.2 to 2.5. The NOCO GENIUS2 leads on features, value and charge current. The Battery Tender Junior 750 mA wins on warranty. The Battery Tender Junior 750 mA costs $12.95 less ($37 vs $49.95).
Battery Tender Junior 750 mA
#16 in Up to 5 AFull review
The classic set and forget maintainer for lead acid batteries in stored motorcycles, mowers and summer cars. Skip it for lithium batteries or for recharging flat car batteries.
Amazon $37$37
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the NOCO GENIUS2 for features (lithium mode, temperature compensation, repair mode vs temperature compensation), value ($24.98 per amp ($49.95, 2 A) vs $49.33 per amp ($37, 0.8 A)) and charge current (2 A vs 0.8 A).
- Choose the Battery Tender Junior 750 mA for warranty (5-year warranty vs 3-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every up to 5 A battery charger; a clear win is highlighted. How we rank explains each one.
| Factor weight | NOCO GENIUS2 | Battery Tender Junior 750 mA |
|---|---|---|
| Overall rating | 3.2/5 | 2.5/5 |
| Value 35% | 43 $24.98 per amp ($49.95, 2 A) | 10 $49.33 per amp ($37, 0.8 A) |
| Charge current 20% | 25 2 A | 0 0.8 A |
| Features 25% | 75 lithium mode, temperature compensation, repair mode | 25 temperature compensation |
| Warranty 20% | 50 3-year warranty | 100 5-year warranty |
Specifications
| NOCO GENIUS2 | Battery Tender Junior 750 mA | |
|---|---|---|
| Charging | ||
| Charge current | 2 A | 0.75 A |
| Voltage | 6/12 V | 12 V |
| Largest battery | 40 Ah | 30 Ah |
| Lithium mode | Yes | No |
| AGM mode | Yes | No |
| Temperature compensation | Yes | Yes |
| Repair mode | Yes | No |
| Power supply mode | No | No |
| Build | ||
| Ingress rating | IP65 | - |
| Weight | 1.1 lb | 0.7 lb |
| Warranty | 3 years | 5 years |
| Released | 2019-11-08 | - |