A premium 4 A class charger and maintainer for owners who want lithium support and CTEK’s five year warranty in one compact unit.
Amazon $124.99
For car owners who want to know exactly when the battery will be ready, with AGM support for modern start stop vehicles.
- 4.3 ACharge current
- 12 VVoltage
- NoLithium mode
- 5 yearsWarranty
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
- Countdown display shows how long until the battery is ready to use
- AGM and recondition programs for start stop car batteries
- Five year warranty and IP65 housing
- No lithium program
- Not meant for small motorcycle batteries under 20 Ah
- Amazon listing is sold by a third party
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its current. How we rank explains each one.
Specifications
| Model number | 40-255 |
|---|---|
| Charging | |
| Charge current | 4.3 A |
| Voltage | 12 V |
| Largest battery | 160 Ah |
| Lithium mode | No |
| AGM mode | Yes |
| Temperature compensation | Yes |
| Repair mode | Yes |
| Power supply mode | No |
| Build | |
| Ingress rating | IP65 |
| Warranty | 5 years |
| Released | 2018-07-30 |
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