ProMariner ProSport HD 20
#6 in 1 and 2 bankFull review
For a boat with a starting battery and a big 12 V trolling or house battery, where shared current gets the drained battery full fastest.
Amazon $249.99$249.99
The ProMariner ProSport HD 20 is the better onboard marine battery charger overall, rated 3.5 to 2.9. The ProMariner ProSport HD 20 leads on value and charge current. The ProMariner ProSport HD 8 costs $80 less ($169.99 vs $249.99).
ProMariner ProSport HD 8
#13 in 1 and 2 bankFull review
For a small boat with a starting battery and a modest trolling battery, from a maker whose chargers are built for engine compartments.
Amazon $169.99$169.99
Prices were last checked November 2, 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 ProMariner ProSport HD 20 for value ($12.50 per amp ($249.99, 20 A total) vs $21.25 per amp ($169.99, 8 A total)) and charge current (20 A total vs 8 A total).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 1 and 2 bank onboard marine battery charger; a clear win is highlighted. How we rank explains each one.
| Factor weight | ProMariner ProSport HD 20 | ProMariner ProSport HD 8 |
|---|---|---|
| Overall rating | 3.5/5 | 2.9/5 |
| Value 30% | 72 $12.50 per amp ($249.99, 20 A total) | 39 $21.25 per amp ($169.99, 8 A total) |
| Charge current 15% | 58 20 A total | 8 8 A total |
| Features 25% | 50 lithium mode, IP67 or better | 50 lithium mode, IP67 or better |
| Warranty 30% | 50 3-year warranty | 50 3-year warranty |
Specifications
| ProMariner ProSport HD 20 | ProMariner ProSport HD 8 | |
|---|---|---|
| Charging | ||
| Banks | 2 | 2 |
| Total current | 20 A | 8 A |
| Lithium mode | Yes | Yes |
| AGM mode | Yes | Yes |
| Build | ||
| Water rating | IP67 | IP67 |
| Display or app | No | No |
| Ignition protected | Yes | Yes |
| Weight | 7.2 lb | 5.2 lb |
| Warranty | 3 years | 3 years |
| Released | 2021-01-25 | - |