# Battery Tender Plus (021-0128) vs CGUFB2008 8A Smart Battery Charger: specs and price compared

A sourced, side-by-side comparison of the Battery Tender Plus (021-0128) (Battery Tender) and CGUFB2008 8A Smart Battery Charger (Ampeak) among car battery chargers.

## Side by side

| Spec | Battery Tender Plus (021-0128) | CGUFB2008 8A Smart Battery Charger |
| --- | --- | --- |
| US price | not published | not published |
| Brand | Battery Tender | Ampeak |
| 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 | — | — |

## Key differences

- 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 %

## Sources

- Battery Tender Plus (021-0128): https://www.manualslib.com/manual/1661410/Battery-Tender-Plus-12v1-25a.html (manualslib.com, verified 2026-08-01)
- CGUFB2008 8A Smart Battery Charger: https://www.manualslib.com/manual/2017555/Ampeak-Cgufb2008.html (manualslib.com, verified 2026-08-01)

Canonical: https://frontdeskreview.com/gear/car-battery-chargers/battery-tender-plus-021-0128-vs-ampeak-cgufb2008/
Cite: Per The Front Desk Review, Battery Tender Plus (021-0128) (not published) vs CGUFB2008 8A Smart Battery Charger (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/car-battery-chargers/battery-tender-plus-021-0128-vs-ampeak-cgufb2008/
License: CC BY 4.0.