A dead battery is the number one reason standby generators fail to start during power outages. Your generator's battery must deliver enough cranking amps to turn the starter motor every time, whether it is a mild spring evening or a freezing January morning. Unity Power & Light provides professional generator battery testing, diagnosis, and same-day replacement throughout Aiken, SC.
We stock batteries for all major generator brands and carry both AGM (Absorbed Glass Mat) and flooded lead-acid options. Our technicians test, diagnose, replace, and verify your generator starts reliably before leaving your property.
Our Battery Replacement Process
Battery Testing & Diagnosis
We perform a comprehensive load test on your existing battery to determine its true condition. A simple voltage reading is not enough because a battery can show full voltage at rest but fail to deliver adequate cranking current. Our load test measures actual cranking amps, internal resistance, and charge acceptance to provide a definitive diagnosis.
Charger System Verification
Before installing a new battery, we verify that the generator's battery charger is functioning correctly. A faulty charger will kill a new battery just as it killed the old one. We measure charging voltage and current to confirm the charger is delivering proper charge to maintain the battery between generator starts.
Battery Replacement
We install the correct replacement battery matching your generator manufacturer's specifications for cranking amps, amp-hour capacity, and physical dimensions. We clean the cable terminals, apply corrosion-resistant treatment, and torque all connections to specification. The old battery is removed and properly recycled.
Start Verification
After installation, we run a complete generator exercise cycle to verify reliable starting and proper charging. We confirm the generator starts within the expected time, runs smoothly, and the charger begins maintaining the new battery correctly.
Battery Types We Install
AGM Batteries (Recommended)
AGM (Absorbed Glass Mat) batteries are our recommended choice for standby generators. They are maintenance-free, have a slower self-discharge rate (critical for generators that sit idle for weeks), provide higher cranking amps per pound, and last 4 to 6 years in the Aiken climate. AGM batteries cost more upfront but provide better reliability and longer service life.
Flooded Lead-Acid Batteries
Traditional flooded batteries are a cost-effective option that provides reliable service when properly maintained. They require periodic electrolyte level checks and water additions, particularly in hot weather. Flooded batteries typically last 3 to 4 years in the Aiken climate and cost 30 to 50 percent less than AGM alternatives.
Pricing
All pricing includes the battery, installation, terminal treatment, start verification, and recycling of the old battery. No hidden fees.
Need a Generator Battery Replacement?
Same-day service available throughout Aiken, SC and surrounding areas. Do not wait for the next outage to discover your battery is dead.