NOCO
GENIUS10
$99.95
Best Car Battery Chargers · head-to-head
GENIUS10 vs Battery Tender Plus (021-0128)
A sourced, side-by-side comparison. GENIUS10 is cheaper at $99.95. Every spec and price links to its source.
Battery Tender
Battery Tender Plus (021-0128)
—
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | GENIUS10 | Battery Tender Plus (021-0128) |
|---|---|---|
| US price | $99.95 | — |
| Brand | NOCO | Battery Tender |
| Released | — | — |
| Max charge amps | 10 | 1.25 |
| Voltage support (V) | 6, 12 | 12 |
| Battery chemistry | Wet/Flooded, Gel, AGM, EFB and Maintenance-Free lead-acid (up to 230Ah); Lithium (LiFePO4) | Flooded, Sealed/GRT (Gas Recombinant Technology), and AGM 12V lead-acid batteries |
| Modes | MODE button selects Standard 12V / AGM 12V / Lithium 12V / 6V charge profiles; fully automatic multi-stage charging with Force Mode for batteries below 1V and automatic sulfation repair | Fully automatic 4-step charging: bulk charge, absorption, and adaptive float/maintenance (ISM) |
| Waterproof rating | IP65 | — |
| Reverse polarity protection | Yes | — |
| Display | LED indicator array (voltage, mode, temperature, battery %, fault icons) around a MODE selector button | 3-LED indicator (red = bulk charging, flashing green = absorption, solid green = float/complete) |
| Temperature compensation | Yes | — |
Sources — GENIUS10: no.co (verified 2026-08-01). Battery Tender Plus (021-0128): manualslib.com (verified 2026-08-01).
What's the difference between the GENIUS10 and Battery Tender Plus (021-0128)?
Where the two actually differ on the specs we track (5 of 8). Matching specs are omitted.
- Max charge amps: GENIUS10 10 vs Battery Tender Plus (021-0128) 1.25
- Voltage support (V): GENIUS10 6, 12 vs Battery Tender Plus (021-0128) 12
- Battery chemistry: GENIUS10 Wet/Flooded, Gel, AGM, EFB and Maintenance-Free lead-acid (up to 230Ah); Lithium (LiFePO4) vs Battery Tender Plus (021-0128) Flooded, Sealed/GRT (Gas Recombinant Technology), and AGM 12V lead-acid batteries
- Modes: GENIUS10 MODE button selects Standard 12V / AGM 12V / Lithium 12V / 6V charge profiles; fully automatic multi-stage charging with Force Mode for batteries below 1V and automatic sulfation repair vs Battery Tender Plus (021-0128) Fully automatic 4-step charging: bulk charge, absorption, and adaptive float/maintenance (ISM)
- Display: GENIUS10 LED indicator array (voltage, mode, temperature, battery %, fault icons) around a MODE selector button vs Battery Tender Plus (021-0128) 3-LED indicator (red = bulk charging, flashing green = absorption, solid green = float/complete)