# GENIUS10 vs Battery Tender Plus (021-0128): specs and price compared

A sourced, side-by-side comparison of the GENIUS10 (NOCO) and Battery Tender Plus (021-0128) (Battery Tender) among car battery chargers.

## Side by side

| Spec | GENIUS10 | Battery Tender Plus (021-0128) |
| --- | --- | --- |
| US price | $99.95 | not published |
| Brand | NOCO | Battery Tender |
| 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 | — |

## Key differences

- 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)

## Sources

- GENIUS10: https://no.co/genius10/specs (no.co, verified 2026-08-01)
- Battery Tender Plus (021-0128): https://www.manualslib.com/manual/1661410/Battery-Tender-Plus-12v1-25a.html (manualslib.com, verified 2026-08-01)

Canonical: https://frontdeskreview.com/gear/car-battery-chargers/noco-genius10-vs-battery-tender-plus-021-0128/
Cite: Per The Front Desk Review, GENIUS10 ($99.95) vs Battery Tender Plus (021-0128) (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/car-battery-chargers/noco-genius10-vs-battery-tender-plus-021-0128/
License: CC BY 4.0.