Battery Chargers · Head-to-head
Battery Tender 021-0123 vs NOCO GENIUS5
Best for Motorcycles & Powersports
Battery Tender 021-0123
7.3/10
$37.95 at Amazon
Check price at Amazon
The short answer
NOCO GENIUS5 comes out ahead overall with 8.6/10 against 7.3/10 for the Battery Tender 021-0123. Battery Tender 021-0123 is stronger on ease of use & hookup. NOCO GENIUS5 is stronger on long-term maintenance performance, battery compatibility, durability, weather & cold resistance, safety, certifications & energy and value. At current verified prices, the Battery Tender 021-0123 costs about $32.00 less.
- Choose the Battery Tender 021-0123 if: Riders storing one 12V lead-acid motorcycle, ATV, snowmobile or mower battery who want the classic plug-in harness maintainer.
- Choose the NOCO GENIUS5 if: Anyone storing a single car, truck, motorcycle, mower or boat battery (lead-acid or LiFePO4) who wants one unit that maintains all winter and recovers a weak battery in spring.
Scores by criterion
| Criterion | Battery Tender 021-0123 | NOCO GENIUS5 |
|---|---|---|
| Long-term maintenance performance | 7.5Reliable float maintenance, but no low-voltage recovery. | 8.8Automatic float/maintenance with temperature compensation and Force mode for low batteries; Bob Vila confirmed it auto-switches to maintain. |
| Battery compatibility | 5.512V lead-acid only, with low current suited to powersports batteries. | 9.26V/12V lead-acid and LiFePO4 up to 120Ah, which covers mowers through full-size trucks. |
| Ease of use & hookup | 8.3The quick-disconnect harness makes it easy to plug in every season. | 8.0Set-and-forget with clear mode LEDs; Bob Vila and The Drive note short leads and a vague manual. |
| Durability, weather & cold resistance | 7.55-year warranty; some reports of failure after a few years; no IP rating. | 8.3IP65 housing, rated -4°F to 104°F, 3-year warranty; some reports of units dying early. |
| Safety, certifications & energy | 7.0Spark-proof and reverse-polarity protected; the standard model is not compliant with CA/OR efficiency rules. | 7.5Spark-proof and reverse-polarity protected, no CPSC recall; UL/ETL marks differ by retailer and are unconfirmed on NOCO's site. |
| Value | 8.2$37 with a 5-year warranty is good for a powersports owner. | 8.5$69.95 sold by Amazon for 5A, lithium support and 120Ah coverage. |
Specifications
| Spec | Battery Tender 021-0123 | NOCO GENIUS5 |
|---|---|---|
| Max charge current | 0.75 A | 5 A |
| Battery voltages | 12V | 6V / 12V |
| Battery chemistries | Flooded, AGM, gel lead-acid | Flooded, gel, AGM, maintenance-free lead-acid; LiFePO4 |
| Lithium (LiFePO4) mode | No | Yes |
| Max rated battery capacity | — | 120 Ah |
| Charging banks | 1 banks | 1 banks |
| Temperature compensation | — | Yes |
| Charges deeply discharged (<1V) batteries | No | Yes |
| Ingress protection | — | IP65 |
| Warranty | 5 years | 3 years |
| Safety / efficiency certifications | — | UL Listed per Best Buy listing (retailers list differing marks: ETL/FCC at Canadian Tire, CE/RoHS elsewhere) |
| Power source | AC wall outlet | AC wall outlet |
Battery Tender 021-0123
Pros
- Simple quick-disconnect harness
- 5-year warranty
- Compact
- Recommended by Car and Driver, The Drive and BestReviews
- Budget price
Cons
- 12V lead-acid only
- Can't recharge a dead battery
- Not sold in CA/OR
- Some buyers report failures after a few years
A straightforward, low-cost maintainer for one motorcycle, ATV or mower battery.
Full Battery Tender 021-0123 review →NOCO GENIUS5
Pros
- Works with 6V/12V lead-acid and LiFePO4
- Handles batteries up to 120Ah
- Temperature compensation and Force mode for weak batteries
- IP65 housing, rated to -4°F
- Recommended by The Drive, Autoweek, BestReviews and Auto Express
Cons
- Short leads can make some batteries hard to reach
- Vague manual
- A few reports of early failures
- 5A is slower than 10A units for bulk charging
The best all-round winter maintainer for a single vehicle or small-engine battery, and the one we would buy first.
Full NOCO GENIUS5 review →Both products are part of our guide The Best Battery Maintainers / Trickle Chargers for Winter Storage of 2026, where you can see every pick, how we score and current prices from each retailer.