Noco Genius 2 vs Battery Tender Plus: Which One Should You Buy?

The listing states a 1.25 AMP 12V charger that is fully selectable 6V or 12V, provides a full charge before automatically switching to float mode, and suits lead-acid, flooded and sealed maintenance free batteries including AGM and gel cell. It states a spark-proof connection during lead connection, automatic reverse polarity detection, and a 5 Year Industry Leading Warranty in the bullets with a 5 Year Manufacturer Warranty in the spec table. The maker claims 50% more charging power than the Battery Tender Junior (021-0123). The spec table gives dimensions of 3.86 inches by 1.87 inches by 8.3 inches and a weight of 1.44 pounds.

Who it's for: owners of powersports batteries who want a complete selectable charger with stated protections and a 5 year term. Who should skip it: buyers who need a lithium charger or a stated cord length.

Its Solar Score of 9.7/10 comes from performance 30/35, build 21/25, value 21/25, safety 8/10 and warranty 5/5: 85 of 100 points, placed on our 9.2 to 9.8 scale.

Figures as published on the retailer listing, collected 29 October 2026. Performance figures are manufacturer rated.

What this listing states. Spark-proof lead connection and reverse polarity detection stated, so safety scores 8 of 10. 5 Year Manufacturer Warranty stated, so warranty scores 5 of 5. See How We Pick.

Match the charger. Use a charger mode that matches your battery's stated chemistry and voltage, connect in the order the manual gives, and keep it ventilated and dry.

This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.

The listing states a 12V 1.25 AMP charger and maintainer that provides a full charge before switching to float mode to maintain voltage for safe long-term storage without overcharging, and suits AGM and flooded batteries. It also states advanced algorithms and a California compliant charger. The spec table gives dimensions of 1.5 inches by 5.0 inches by 3.0 inches and a weight of 2.0 pounds, with a warranty description that reads only as Manufacturer Warranty, so no term can be quoted.

Who it's for: owners who want a complete 12V charger for AGM and flooded batteries in long-term storage. Who should skip it: buyers who want a stated warranty term, a named protection feature, or 6V selection.

Its Solar Score of 9.4/10 comes from performance 29/35, build 20/25, value 20/25, safety 0/10 and warranty 0/5: 69 of 100 points, placed on our 9.2 to 9.8 scale.

Figures as published on the retailer listing, collected 29 October 2026. Performance figures are manufacturer rated.

What this listing states. No protection feature or safety listing is stated, so safety scores zero. No warranty term, so warranty scores zero. See How We Pick.

Match the charger. Use a charger mode that matches your battery's stated chemistry and voltage, connect in the order the manual gives, and keep it ventilated and dry.

This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.

The listing states M10 eyelets that mount on battery terminals once, leaving a plug-in charging point so a GENIUS charger connects in seconds when the vehicle is parked, with a 21-inch cable for moving a single GENIUS between batteries. The eyelets are copper-plated and lie flat on the terminals, a 20A micro blade fuse guards against shorts, and the X-Connect connector seals out dirt and water. It works with the GENIUS models the listing names, from GENIUS1 to GENIUS10, and is not compatible with Boost or Boost X jump starters. The charger is sold separately, and the spec table states a 1-Year Limited warranty term.

Who it's for: GENIUS owners who want eyelets left mounted on larger terminals across several vehicles. Who should skip it: buyers who need a charger in the box, or owners of Boost jump starters.

Its Solar Score of 9.2/10 comes from performance 14/35, build 19/25, value 16/25, safety 5/10 and warranty 3/5: 57 of 100 points, placed on our 9.2 to 9.8 scale.

Figures as published on the retailer listing, collected 29 October 2026. Performance figures are manufacturer rated.

What this listing states. 20A micro blade fuse and sealed X-Connect connector stated, so safety scores 5 of 10. 1-Year Limited warranty term stated. It does not say everything a buyer needs, such as who pays return shipping, so warranty scores 3 of 5. See How We Pick.

Match the charger. Use a charger mode that matches your battery's stated chemistry and voltage, connect in the order the manual gives, and keep it ventilated and dry.

This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.

The listing states an adapter that converts a GENIUS charger X-Connect to the SAE connector found on traditional chargers, so it plugs into SAE leads already wired to a motorcycle, ATV, snowmobile, boat or mower without rewiring. It is about 2.75 inches long, its rugged connector seals out dirt, water, gas and oil, and a built-in 20A micro blade fuse guards against shorts. It works with GENIUS1, GENIUS2, GENIUS2X2, GENIUS2X4, GENIUS5 and GENIUS10 plus G750, G1100, G3500, G7200 and G4, and is not compatible with Boost or Boost X jump starters. The charger is sold separately, and the spec table states a 1-Year Limited warranty term.

Who it's for: GENIUS owners whose vehicles already carry SAE leads and who want to switch chargers without rewiring. Who should skip it: buyers who need a charger in the box, or owners of Boost jump starters.

Its Solar Score of 9.2/10 comes from performance 13/35, build 18/25, value 15/25, safety 5/10 and warranty 3/5: 54 of 100 points, placed on our 9.2 to 9.8 scale.

Figures as published on the retailer listing, collected 29 October 2026. Performance figures are manufacturer rated.

What this listing states. 20A micro blade fuse and sealed connector stated, so safety scores 5 of 10. 1-Year Limited warranty term stated. It does not say everything a buyer needs, such as who pays return shipping, so warranty scores 3 of 5. See How We Pick.

Match the charger. Use a charger mode that matches your battery's stated chemistry and voltage, connect in the order the manual gives, and keep it ventilated and dry.

This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.