Battery Chargers · Head-to-head
CTEK 40-206 (MXS 5.0) vs NOCO GENIUS5
Best for Collector & Classic Cars
CTEK 40-206 (MXS 5.0)
7.8/10
$94.99 at Amazon
Check price at Amazon
The short answer
NOCO GENIUS5 comes out ahead overall with 8.6/10 against 7.8/10 for the CTEK 40-206 (MXS 5.0). CTEK 40-206 (MXS 5.0) is stronger on durability, weather & cold resistance. NOCO GENIUS5 is stronger on battery compatibility, ease of use & hookup, safety, certifications & energy and value. At current verified prices, the NOCO GENIUS5 costs about $25.04 less.
- Choose the CTEK 40-206 (MXS 5.0) if: Owners of 12V lead-acid collector or performance cars (including AGM and EFB) who store them for months and want premium multi-stage float and pulse maintenance.
- 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 | CTEK 40-206 (MXS 5.0) | NOCO GENIUS5 |
|---|---|---|
| Long-term maintenance performance | 9.0Float/pulse maintenance mode with temperature compensation, trusted for long-term collector storage; won't start on fully dead batteries. | 8.8Automatic float/maintenance with temperature compensation and Force mode for low batteries; Bob Vila confirmed it auto-switches to maintain. |
| Battery compatibility | 6.512V wet/AGM/gel/EFB up to 110Ah (maintains to 160Ah per CTEK's EU sheet); no 6V, no lithium. | 9.26V/12V lead-acid and LiFePO4 up to 120Ah, which covers mowers through full-size trucks. |
| Ease of use & hookup | 7.5Simple mode button and clear LEDs; The Drive notes a short cord and vague instructions. | 8.0Set-and-forget with clear mode LEDs; Bob Vila and The Drive note short leads and a vague manual. |
| Durability, weather & cold resistance | 8.7IP65, 5-year warranty and a strong long-term reputation; runs warm. | 8.3IP65 housing, rated -4°F to 104°F, 3-year warranty; some reports of units dying early. |
| Safety, certifications & energy | 7.0Spark-proof, short-circuit and reverse-polarity protected; no US UL/ETL mark confirmed. | 7.5Spark-proof and reverse-polarity protected, no CPSC recall; UL/ETL marks differ by retailer and are unconfirmed on NOCO's site. |
| Value | 6.5About $95 from a third-party Amazon seller is expensive for a 12V-only unit, and the warranty chain is uncertain. | 8.5$69.95 sold by Amazon for 5A, lithium support and 120Ah coverage. |
Specifications
| Spec | CTEK 40-206 (MXS 5.0) | NOCO GENIUS5 |
|---|---|---|
| Max charge current | 4.3 A | 5 A |
| Battery voltages | 12V | 6V / 12V |
| Battery chemistries | Wet, MF, Ca/Ca, AGM, EFB, gel lead-acid | Flooded, gel, AGM, maintenance-free lead-acid; LiFePO4 |
| Lithium (LiFePO4) mode | No | Yes |
| Max rated battery capacity | 110 Ah | 120 Ah |
| Charging banks | 1 banks | 1 banks |
| Temperature compensation | Yes | Yes |
| Charges deeply discharged (<1V) batteries | No | Yes |
| Ingress protection | IP65 | 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 |
CTEK 40-206 (MXS 5.0)
Pros
- 8-step charging with float/pulse maintenance
- Temperature compensation
- IP65 housing
- 5-year warranty
- Used by Road & Track's expert across a large collection
Cons
- 12V lead-acid only
- Won't charge a completely dead battery
- Short cord and vague instructions
- No confirmed US safety mark
A refined choice for lead-acid classics, as long as you buy from a reliable seller.
Full CTEK 40-206 (MXS 5.0) 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.