Battery Tender
Battery Tender Plus (021-0128)
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Best Car Battery Chargers · head-to-head
Battery Tender Plus (021-0128) vs CGUFB2008 8A Smart Battery Charger
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) |  CGUFB2008 8A Smart Battery Charger |
|---|---|---|
| US price | — | — |
| Brand | Battery Tender | Ampeak |
| Released | — | — |
| Max charge amps | 1.25 | 8 |
| Voltage support (V) | 12 | 6, 12 |
| Battery chemistry | Flooded, Sealed/GRT (Gas Recombinant Technology), and AGM 12V lead-acid batteries | Gel, AGM, and STD (standard flooded) lead-acid batteries |
| Modes | Fully automatic 4-step charging: bulk charge, absorption, and adaptive float/maintenance (ISM) | Selectable 6V-2A / 12V-2A / 12V-8A rates; 7-stage charging at 12V (desulfation, soft start, bulk, absorption, battery test, reconditioning, float) and 3-stage at 6V (bulk, absorption, float) |
| 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 display (current/voltage) with status LEDs for charge status, battery reconditioning, reverse polarity, and capacity % |
| Temperature compensation | — | — |
Sources — Battery Tender Plus (021-0128): manualslib.com (verified 2026-08-01). CGUFB2008 8A Smart Battery Charger: manualslib.com (verified 2026-08-01).
What's the difference between the Battery Tender Plus (021-0128) and CGUFB2008 8A Smart Battery Charger?
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 CGUFB2008 8A Smart Battery Charger 8
- Voltage support (V): Battery Tender Plus (021-0128) 12 vs CGUFB2008 8A Smart Battery Charger 6, 12
- Battery chemistry: Battery Tender Plus (021-0128) Flooded, Sealed/GRT (Gas Recombinant Technology), and AGM 12V lead-acid batteries vs CGUFB2008 8A Smart Battery Charger Gel, AGM, and STD (standard flooded) lead-acid batteries
- Modes: Battery Tender Plus (021-0128) Fully automatic 4-step charging: bulk charge, absorption, and adaptive float/maintenance (ISM) vs CGUFB2008 8A Smart Battery Charger Selectable 6V-2A / 12V-2A / 12V-8A rates; 7-stage charging at 12V (desulfation, soft start, bulk, absorption, battery test, reconditioning, float) and 3-stage at 6V (bulk, absorption, float)
- Display: Battery Tender Plus (021-0128) 3-LED indicator (red = bulk charging, flashing green = absorption, solid green = float/complete) vs CGUFB2008 8A Smart Battery Charger Red 7-segment LED digital display (current/voltage) with status LEDs for charge status, battery reconditioning, reverse polarity, and capacity %