Battery Tender
Battery Tender Plus (021-0128)
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Best Car Battery Chargers · head-to-head
Battery Tender Plus (021-0128) vs DXAEC100 30A Battery Charger, Engine Starter & Maintainer
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) |  DXAEC100 30A Battery Charger, Engine Starter & Maintainer |
|---|---|---|
| US price | — | — |
| Brand | Battery Tender | DEWALT |
| Released | — | — |
| Max charge amps | 1.25 | 30 |
| Voltage support (V) | 12 | 12 |
| Battery chemistry | Flooded, Sealed/GRT (Gas Recombinant Technology), and AGM 12V lead-acid batteries | WET, GEL, and AGM 12V lead-acid batteries |
| Modes | Fully automatic 4-step charging: bulk charge, absorption, and adaptive float/maintenance (ISM) | Battery charge (30A) / maintain (3A), 100A engine start, battery reconditioning (electric-pulse desulfation), alternator check, and battery voltage test |
| Waterproof rating | — | — |
| Reverse polarity protection | — | — |
| Display | 3-LED indicator (red = bulk charging, flashing green = absorption, solid green = float/complete) | Blue backlit digital LCD (amps, battery/alternator status icons) with dedicated one-touch function buttons |
| Temperature compensation | — | — |
Sources — Battery Tender Plus (021-0128): manualslib.com (verified 2026-08-01). DXAEC100 30A Battery Charger, Engine Starter & Maintainer: dewalt12volt.com (verified 2026-08-01).
What's the difference between the Battery Tender Plus (021-0128) and DXAEC100 30A Battery Charger, Engine Starter & Maintainer?
Where the two actually differ on the specs we track (4 of 8). Matching specs are omitted.
- Max charge amps: Battery Tender Plus (021-0128) 1.25 vs DXAEC100 30A Battery Charger, Engine Starter & Maintainer 30
- Battery chemistry: Battery Tender Plus (021-0128) Flooded, Sealed/GRT (Gas Recombinant Technology), and AGM 12V lead-acid batteries vs DXAEC100 30A Battery Charger, Engine Starter & Maintainer WET, GEL, and AGM 12V lead-acid batteries
- Modes: Battery Tender Plus (021-0128) Fully automatic 4-step charging: bulk charge, absorption, and adaptive float/maintenance (ISM) vs DXAEC100 30A Battery Charger, Engine Starter & Maintainer Battery charge (30A) / maintain (3A), 100A engine start, battery reconditioning (electric-pulse desulfation), alternator check, and battery voltage test
- Display: Battery Tender Plus (021-0128) 3-LED indicator (red = bulk charging, flashing green = absorption, solid green = float/complete) vs DXAEC100 30A Battery Charger, Engine Starter & Maintainer Blue backlit digital LCD (amps, battery/alternator status icons) with dedicated one-touch function buttons