CTEK NXT 5
#4 in Up to 5 AFull review
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$124.99
The CTEK NXT 5 is the better battery charger overall, rated 3.9 to 2.9. The CTEK NXT 5 leads on features, warranty and value. The CTEK NXT 5 costs $25 less ($124.99 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 NXT 5 for features (lithium mode, temperature compensation, repair mode vs lithium mode), warranty (5-year warranty vs 3-year warranty) and value ($29.07 per amp ($124.99, 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 NXT 5 | Optima Digital 400+ |
|---|---|---|
| Overall rating | 3.9/5 | 2.9/5 |
| Value 35% | 36 $29.07 per amp ($124.99, 4.3 A) | 23 $37.50 per amp ($149.99, 4 A) |
| Charge current 20% | 82 4.3 A | 75 4 A |
| Features 25% | 75 lithium mode, temperature compensation, repair mode | 25 lithium mode |
| Warranty 20% | 100 5-year warranty | 50 3-year warranty |
Specifications
| CTEK NXT 5 | Optima Digital 400+ | |
|---|---|---|
| Charging | ||
| Charge current | 4.3 A | 4 A |
| Voltage | 12 V | 12 V |
| Largest battery | 160 Ah | - |
| Lithium mode | Yes | Yes |
| AGM mode | Yes | Yes |
| Temperature compensation | Yes | No |
| Repair mode | Yes | No |
| Power supply mode | - | No |
| Build | ||
| Ingress rating | IP65 | - |
| Weight | 1.3 lb | 3 lb |
| Warranty | 5 years | 3 years |
| Released | 2025-11-11 | 2024-04 |