Battery Tender
Battery Tender Plus (021-0128)
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Best Car Battery Chargers · head-to-head
Battery Tender Plus (021-0128) vs SC1281 6/2/30/100A Charger & Engine Starter
A sourced, side-by-side comparison. Battery Tender Plus (021-0128) is cheaper at —. Every spec and price links to its source.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Battery Tender Plus (021-0128) |  SC1281 6/2/30/100A Charger & Engine Starter |
|---|---|---|
| US price | — | — |
| Brand | Battery Tender | Schumacher |
| Released | — | — |
| Max charge amps | 1.25 | 12 |
| Voltage support (V) | 12 | 6, 12 |
| Battery chemistry | Flooded, Sealed/GRT (Gas Recombinant Technology), and AGM 12V lead-acid batteries | Standard (flooded), AGM, Gel, and Deep-Cycle lead-acid batteries |
| Modes | Fully automatic 4-step charging: bulk charge, absorption, and adaptive float/maintenance (ISM) | 5-in-1: battery charger (2/6/12A continuous, multi-stage, microprocessor-controlled), battery maintainer, 30A boost/rapid charge, 100A engine start, plus built-in battery and alternator testing |
| Waterproof rating | — | — |
| Reverse polarity protection | — | Yes |
| Display | 3-LED indicator (red = bulk charging, flashing green = absorption, solid green = float/complete) | Red 7-segment LED digital readout plus indicator lights for rate selection, battery type, and a clamps-reversed warning |
| Temperature compensation | — | — |
Sources — Battery Tender Plus (021-0128): manualslib.com (verified 2026-08-01). SC1281 6/2/30/100A Charger & Engine Starter: schumacherelectric.com (verified 2026-08-01).
What's the difference between the Battery Tender Plus (021-0128) and SC1281 6/2/30/100A Charger & Engine Starter?
Where the two actually differ on the specs we track (5 of 8). Matching specs are omitted.
- Max charge amps: Battery Tender Plus (021-0128) 1.25 vs SC1281 6/2/30/100A Charger & Engine Starter 12
- Voltage support (V): Battery Tender Plus (021-0128) 12 vs SC1281 6/2/30/100A Charger & Engine Starter 6, 12
- Battery chemistry: Battery Tender Plus (021-0128) Flooded, Sealed/GRT (Gas Recombinant Technology), and AGM 12V lead-acid batteries vs SC1281 6/2/30/100A Charger & Engine Starter Standard (flooded), AGM, Gel, and Deep-Cycle lead-acid batteries
- Modes: Battery Tender Plus (021-0128) Fully automatic 4-step charging: bulk charge, absorption, and adaptive float/maintenance (ISM) vs SC1281 6/2/30/100A Charger & Engine Starter 5-in-1: battery charger (2/6/12A continuous, multi-stage, microprocessor-controlled), battery maintainer, 30A boost/rapid charge, 100A engine start, plus built-in battery and alternator testing
- Display: Battery Tender Plus (021-0128) 3-LED indicator (red = bulk charging, flashing green = absorption, solid green = float/complete) vs SC1281 6/2/30/100A Charger & Engine Starter Red 7-segment LED digital readout plus indicator lights for rate selection, battery type, and a clamps-reversed warning