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
2.7/5
For a small boat with a starting battery and a small lead acid trolling battery, on a tight budget.
- 2 x 4 AOutput
- 8 ATotal current
- NoLithium mode
- IP67Water rating
Check price at Amazon$121.86
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Low price for a UL listed, ignition protected onboard charger
- IP67 aluminum housing shrugs off spray and bilge water
- Separate charging and sensing on each bank, so a drained trolling battery does not hold back the starting battery
Cons
- 4 A per bank is slow for a large deep cycle battery
- No lithium profile, so it cannot charge a LiFePO4 trolling battery
- Only a 2 year warranty
- Status lights show charging stage, not how full each battery is
The Guest ChargePro family
Every Guest ChargePro model we rank, smallest first. Ratings compare each against its own bank count.
| Model | Output | Rating | Price |
|---|---|---|---|
| Guest ChargePro 2707A (this one) | 2 x 4 A | 2.7/5 | $121.86 |
| Guest ChargePro 2711A | 2 x 5 A | 2.7/5 | $145.83 |
| Guest ChargePro 2720A | 2 x 10 A | 3.3/5 | $182.64 |
| Guest ChargePro 2713A | 3 x 5 A | 2.8/5 | $170 |
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its bank count. How we rank explains each one.
Specifications
| Model number | 2707A |
|---|---|
| Charging | |
| Banks | 2 |
| Current per bank | 4 A |
| Total current | 8 A |
| Lithium mode | No |
| Build | |
| Water rating | IP67 |
| Display or app | No |
| Ignition protected | Yes |
| Weight | 4.5 lb |
| Warranty | 2 years |
Alternatives in this bank count
ProMariner ProSport HD 6
#14 in 1 and 2 bankFull review
For one starting or small trolling battery in a boat with a gasoline engine compartment, where ignition protection matters.
Amazon $135.99$135.99
Guest ChargePro 2711A
#15 in 1 and 2 bankFull review
An affordable two bank charger for lead acid batteries on a small fishing boat. Lithium owners should look elsewhere.
Amazon $145.83$145.83
Compare
Compare the Guest ChargePro 2707A with any other onboard marine battery charger →
More from Guest: every Guest product ranked.