CTEK CT5 Time to Go
#6 in Up to 5 AFull review
For car owners who want to know exactly when the battery will be ready, with AGM support for modern start stop vehicles.
Amazon $113.99$113.99
The CTEK CT5 Time to Go is the better battery charger overall, rated 3.7 to 2.9. The CTEK CT5 Time to Go leads on warranty, features and value. The CTEK CT5 Time to Go costs $36 less ($113.99 vs $149.99).
Optima Digital 400+
#12 in Up to 5 AFull review
A maintainer for owners of OPTIMA AGM or lithium batteries who want matched charge settings and a clear display. Others can get more amps for the money.
Amazon $149.99$149.99
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the CTEK CT5 Time to Go for warranty (5-year warranty vs 3-year warranty), features (temperature compensation, repair mode vs lithium mode) and value ($26.51 per amp ($113.99, 4.3 A) vs $37.50 per amp ($149.99, 4 A)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every up to 5 A battery charger; a clear win is highlighted. How we rank explains each one.
| Factor weight | CTEK CT5 Time to Go | Optima Digital 400+ |
|---|---|---|
| Overall rating | 3.7/5 | 2.9/5 |
| Value 35% | 41 $26.51 per amp ($113.99, 4.3 A) | 23 $37.50 per amp ($149.99, 4 A) |
| Charge current 20% | 82 4.3 A | 75 4 A |
| Features 25% | 50 temperature compensation, repair mode | 25 lithium mode |
| Warranty 20% | 100 5-year warranty | 50 3-year warranty |
Specifications
| CTEK CT5 Time to Go | Optima Digital 400+ | |
|---|---|---|
| Charging | ||
| Charge current | 4.3 A | 4 A |
| Voltage | 12 V | 12 V |
| Largest battery | 160 Ah | - |
| Lithium mode | No | Yes |
| AGM mode | Yes | Yes |
| Temperature compensation | Yes | No |
| Repair mode | Yes | No |
| Power supply mode | No | No |
| Build | ||
| Ingress rating | IP65 | - |
| Weight | - | 3 lb |
| Warranty | 5 years | 3 years |
| Released | 2018-07-30 | 2024-04 |