RV Battery Replacement in Sebastian
Lead-acid, AGM, and lithium battery installation with proper bank sizing and charging system verification. Mobile service across Indian River County.
TL;DR
- Lead-acid, AGM, and lithium LiFePO4 battery options for every budget
- Battery bank sizing for weekend camping through full-time boondocking
- Pricing from $150 to $800 depending on battery type and configuration
- Charging system verification to prevent premature battery failure
- Same-day mobile service in Sebastian and surrounding Indian River County cities
Keeping Your RV Powered in Florida Heat
Your RV's house batteries power everything that runs on 12 volts. That includes your lights, water pump, furnace blower, slide motors, leveling jacks, and the control boards for your refrigerator and water heater. Without healthy batteries, your RV is a box with wheels. And in Florida's heat, batteries die faster than anywhere else in the country.
The average ambient temperature in Sebastian from May through October hovers between 85 and 95 degrees. Inside a battery compartment that sits in direct sun, temperatures can hit 130 degrees or more. Every 15-degree increase above 77 degrees cuts a lead-acid battery's lifespan roughly in half. That's why batteries that last 4 to 5 years in Michigan barely make it 2 years here in Indian River County.
Lead-Acid vs AGM vs Lithium
Standard flooded lead-acid batteries are the cheapest option at $100 to $200 each. They're reliable and widely available at every auto parts store in Sebastian. The downside is that you can only use about 50 percent of their rated capacity before you start damaging the plates. They also need regular watering, they off-gas hydrogen while charging, and they weigh 60 to 70 pounds each.
AGM (absorbed glass mat) batteries cost $200 to $350 each. They're sealed, maintenance-free, and can handle deeper discharges than flooded lead-acid. You can mount them in any orientation without spilling. They're a solid middle-ground option, and they hold up slightly better in heat because the electrolyte is trapped in glass mats rather than sloshing around freely.
Lithium LiFePO4 batteries run $400 to $1,200 each depending on capacity. They're the premium choice, and for good reason. You can use 100 percent of their rated capacity. They weigh about half as much as lead-acid. They charge 5 times faster. They don't need any maintenance. And they last 8 to 10 years versus 2 to 3 years for lead-acid in Florida's climate. Over a decade, lithium actually costs less per usable amp-hour.
12V vs 6V Battery Configurations
Most RVs come with one or two 12-volt batteries. A single group 27 battery provides about 100 amp-hours of capacity, though only 50 amp-hours are usable with lead-acid. That's enough for a weekend trip where you're plugged into shore power most of the time.
For extended dry camping or boondocking, many RV owners switch to 6-volt golf cart batteries wired in series. Two 6-volt batteries give you the same 12 volts but with 200 to 225 amp-hours of capacity. Golf cart batteries are built for deep cycling, which means they can handle being discharged and recharged hundreds of times without losing capacity as fast as standard 12-volt batteries.
Full-timers who camp off-grid regularly need 400 to 600 amp-hours. That's either four 6-volt lead-acid batteries or two to three 100-amp-hour lithium batteries. We'll help you figure out the right size based on your actual power usage, not guesswork.
Proper Charging Matters
The number one reason RV batteries die early isn't heat alone. It's improper charging. Most factory converters use a single-stage charging profile that doesn't fully charge your batteries. A proper multi-stage charger goes through bulk, absorption, and float phases to bring batteries to 100 percent without overcharging them.
If you're upgrading to lithium batteries, your existing converter almost certainly won't work correctly. Lithium batteries need a specific charge voltage of 14.4 to 14.6 volts, and they need the charger to cut off cleanly rather than floating. Running a standard lead-acid charging profile on lithium batteries will either undercharge them or damage the battery management system. We always verify and update the charging profile when we install lithium batteries.
What Battery Replacement Costs
A single lead-acid group 27 battery replacement runs $150 to $200 installed. A pair of 6-volt golf cart batteries costs $200 to $350 installed. AGM batteries run $250 to $400 each installed. A lithium LiFePO4 100-amp-hour battery costs $500 to $800 installed, including wiring updates and charging profile changes. We carry the most popular battery sizes on the truck, so most replacements get completed in under an hour.
Patrick Lee has been installing and upgrading RV battery systems across Indian River County for over 10 years. Whether you need a simple swap or a full lithium upgrade with a battery monitor and new cabling, we'll get it done right on site at your campground, storage lot, or driveway.
RV Battery Replacement FAQ
For most RV owners in Florida, yes. Lithium LiFePO4 batteries cost 3 to 4 times more upfront than lead-acid, but they last 8 to 10 years versus 2 to 3 years for lead-acid in Florida heat. You can use 100 percent of their capacity versus only 50 percent with lead-acid. They weigh about half as much. And they require zero maintenance. Over a 10-year period, lithium typically costs less per usable amp-hour than replacing lead-acid batteries every 2 to 3 years.
Florida heat shortens battery life significantly compared to northern climates. Standard lead-acid batteries last 2 to 3 years here versus 3 to 5 years up north. AGM batteries last 3 to 4 years in Florida. Lithium LiFePO4 batteries hold up best, lasting 8 to 10 years because they handle heat cycles better. The key factors are ambient temperature, depth of discharge, and charging habits. Batteries stored in direct Florida sun without ventilation fail even faster.
Your lights dim noticeably when something else turns on. The water pump sounds sluggish or slow. Your slides or jacks move slowly or stop halfway. The battery reads 12.6 volts when fully charged but drops below 11.5 volts within an hour of use. You see corrosion, swelling, or cracking on the battery case. And the battery won't hold a charge overnight even with nothing running. If you notice any two of these, it's time for a replacement.
It depends on your power usage and how often you camp without shore power. A single 12-volt battery provides about 100 amp-hours, which is enough for a weekend of light use with lights, water pump, and furnace. Two 6-volt batteries wired in series give you 200 to 225 amp-hours for extended dry camping. Full-timers or boondockers often need 400 to 600 amp-hours, which means either four 6-volt lead-acid batteries or two to three lithium batteries.
A single lead-acid group 27 battery replacement runs $150 to $200 installed. A pair of 6-volt golf cart batteries costs $200 to $350 installed. AGM batteries run $250 to $400 each installed. A single lithium LiFePO4 100-amp-hour battery costs $500 to $800 installed, including wiring updates and charging profile adjustments. Multi-battery bank installations with new cables and a battery monitor add $100 to $200 to the total.
A straight swap of the same battery type is doable for a handy owner. But upgrading from lead-acid to lithium involves more than just swapping boxes. Your converter needs a lithium-compatible charging profile or it'll damage the new batteries. The wiring gauge may need upgrading. The battery management system needs proper integration. And the physical mounting must be secure because lithium batteries have different dimensions. We see DIY lithium installs go wrong about once a month, usually because the converter charging profile was never updated.