Starting battery replacement
Engine-start batteries at the boat.
We test and replace starting batteries at your boat and make sure the new one fits the tray.
Services
Marine battery replacement and installation at the boat
Starting, house, and trolling-motor batteries at the dock, the lift, or where the boat is kept.
We come to you.
Who we are
Marine Battery Service is operated by Mobile Battery Pros LLC.
We provide marine battery replacement and installation at your dock, lift, or storage location. We review the battery’s job, tray size, connections, and charging setup before confirming the work.
See counties we come to or request a visit.
Services
Battery work at the boat
Marine battery replacement and installation at the dock, the lift, or where the boat is kept.
Read Starting, house, and trolling-motor batteries.
House and deep-cycle batteries
Lights, pumps, electronics, and living loads.
We service the set of house batteries that run lights, pumps, and electronics, and we check cables and how the set is wired.
Trolling-motor batteries
Dedicated trolling-motor power.
We replace trolling-motor batteries and check the on-board connections so voltage and tray size match the motor.
Help choosing the right battery
What the boat actually needs.
We start with boat type, what the battery has to do (start, house, both, or trolling), tray size, and charging setup.
Battery installation
Help at the boat, when it fits the visit.
Installation can be part of a dockside visit: matching the battery to the tray, cables, and charger. We confirm the scope when we schedule.
Compatibility
Match the battery to the job on the boat.
Different boats need different batteries. This is a starting conversation.
| Job | Typical use | Notes |
|---|---|---|
| Starting | Engine cranking | Sized to the engine and the battery tray. |
| House / deep-cycle | Onboard living loads | Depends on electronics, inverter use, and charging. |
| Dual-purpose | Start plus modest house loads | A single battery doing two jobs. |
| Trolling motor | Dedicated thrust power | Voltage and tray size have to match the motor. |
How it works
From the slip to a charged, ready boat.
A four-step visit at the boat.
Tell us about the boat
Share boat type, where it sits (dock, lift, storage), and whether the need is starting, house, trolling, or unclear.
We review fit
We review the job, tray size, and charging before the visit.
We come to you
Service at the marina, lift, or wherever the boat is kept.
Work done at the boat
Battery work completed on site when the visit is confirmed.
On the boat
Starting, house, and trolling batteries are different jobs.
A starting battery delivers a short burst to crank the engine. A house or deep-cycle battery is built to run lights, pumps, and electronics for hours. A trolling-motor battery is a dedicated deep-cycle set for thrust — often 12, 24, or 36 volts using more than one battery. Dual-purpose batteries try to do starting and modest house loads in one box; they are a compromise, not a magic fit.
- Starting / cranking. Built for a brief high load. Running house loads down on a starting battery shortens its life.
- Deep-cycle / house. Built for repeated discharge. The useful figure is how long it can run a load, not how hard it can crank.
- Trolling. Match voltage and tray size to the motor. Mixing leftover starting batteries into a trolling set is a common way to get stranded.
Flooded, AGM (sealed), gel, and lithium (LiFePO4) batteries
These are battery types. Fit still depends on the tray, the charger, and the job on the boat.
- Flooded lead-acid. Usually the lowest upfront cost. Needs venting and water checks. Heavy. Not a sealed box.
- AGM (sealed) batteries. Sealed and spill-resistant. Handles vibration better than flooded. Costs more than flooded.
- Gel. Sealed. Sensitive to charge voltage — the wrong charger can damage it.
- Lithium (LiFePO4) batteries. Lighter, more usable capacity, longer life, highest upfront cost. Needs a compatible charger and often a battery-management system. Alternator protection is part of a proper install.
Battery size (the case size, often group 24, 27, or 31) has to fit the tray and clamps. Marine cranking amps describe starting punch at a moderate temperature; reserve capacity and amp-hours describe how long a house battery can run. Those numbers only help once the job is clear.
Before a visit
Access and safety checklist
Useful whether we come to the boat or you are preparing the space.
- Where the boat sits: wet slip, lift, trailer, rack, or storage yard. Let us know about gate codes or marina check-in.
- Which battery is the problem: starting, house, trolling, or you are not sure.
- We’ll check that the new battery fits your tray and clamps.
- How you get to the battery: cockpit hatch, console, berth, bilge. Note standing water, fuel smell, or blocked access.
- Charger brand and whether it is on while the boat sits. Lithium and gel need the right charge voltage.
- Cable condition: green crust, cracked boots, loose terminals. Do not “test” a battery by sparking cables.
- Ventilation for flooded batteries. Do not charge a flooded battery in a sealed cabin.
- Eye protection and no smoking around charging batteries. Hydrogen from flooded cells is flammable.
- Old battery weight. Marine batteries are heavy; a second set of hands or a proper strap matters.
Installation can be part of a visit. We confirm the scope when we schedule.
Cost
What actually changes the quote
Every quote is based on your boat. These are the variables that move the number.
- Battery type — lithium costs more up front than AGM (sealed) batteries, which cost more than flooded lead-acid.
- Case size and capacity — a larger battery size and a larger set cost more.
- How many batteries — 24-volt and 36-volt trolling sets are multiple units, not one swap.
- Charging gear — lithium often needs charger or alternator changes; that is separate work.
- Cables, terminals, and tray clamps — corroded hardware is a safety item.
- Access — a battery under a console, in a bilge, or on a sailboat takes longer than one in an open tray.
- Where the boat sits — dock, lift, trailer, or storage, plus travel in the listed service area.
- Old-battery handling — recycling or core return is part of the job when a battery comes off the boat.
Brands
Names you may already have on the boat
You’ll see these names on many recreational boats. Fit is still about the job, the tray size, and the charger. The links go to official sites.
Tampa Bay
Tampa–St. Petersburg
One market across two counties. Hillsborough County and Pinellas County.
Next
Where we come to you
Pick a county in our Florida service area, read Starting, house, and trolling-motor batteries, or battery service questions.
Call
Boat won’t start?
Call (833) 467-7400.
Availability and visit details are confirmed before service.
Next step
Tell us about the boat
Call (833) 467-7400 or request a visit. See questions or where we come to you.