Hybrid Battery Maintenance

The hybrid drive battery is the most overlooked component in your vehicle. We faithfully change the oil, filters, tires, and spark plugs -- yet the high-voltage battery rarely gets a moment's attention until it fails. In our experience, hybrid batteries become vulnerable after 10 to 15 years or roughly 120,000 to 150,000 miles, when individual modules begin to drift out of balance and internal resistance climbs.

Most hybrids on the road today use nickel-metal hydride (NiMH) packs, while newer models increasingly use lithium-ion. A typical NiMH pack wires dozens of modules in series for system voltages well above 100 volts -- the classic Prius pack, for example, runs at a nominal 201.6 volts. Each module holds six 1.2-volt cells. Over time, differences in self-discharge, capacity, and internal resistance between modules cause their states of charge to diverge. That imbalance is what triggers warning lights, fault codes, and declining fuel economy.

Refurbishment -- Starting at $749

Our refurbishment service, starting at $749, includes full diagnostics, wiring harness replacement, individual cell post cleaning, module load testing, controlled discharge-and-recharge cycling, a 4-6 hour balance, coolant duct and fan cleaning, body pan vacuuming, and draining of any standing water. We also install a charging harness for the Prolong battery reconditioning system, so future maintenance recharges are quick and simple. Refurbishment is ideal for aging but still functioning batteries.

All in-house rebuilds include a 12-month warranty. We also offer extended warranties up to lifetime coverage, including a lifetime option at $29.99 per month.

Hybrid Battery Repair

Hybrid batteries commonly suffer from wiring harness corrosion, which causes inconsistent charging across the modules -- some overcharge while others undercharge -- eventually triggering a system failure. We repair your battery in-house, quickly and efficiently, typically for about half of what a dealer charges for a new pack. Repair is our preferred solution when your battery is a good candidate, because you keep your original equipment and you know its history.

Replacement Hybrid Drive Batteries

When a battery is beyond repair, replacement is often the smartest path forward -- and it has become one of our core services. Our mobile team installs replacement packs at your home or workplace, so you never have to arrange a tow or a shop visit.

Refurbished Replacement Batteries

We partner with reputable aftermarket suppliers to source certified refurbished batteries for most hybrid makes and models. These packs are rebuilt with tested modules, balanced for even state of charge, and backed by warranty packages. Contact us for current pricing, availability, and warranty options. Mobile installation is available, subject to inventory.

New OEM Batteries

If you prefer a brand-new pack, we can source and install a new battery through the original manufacturer. Warranty terms vary by manufacturer, and we will pass along the strongest warranty available for your vehicle. Contact us for a quote.

Warranty Options

All of our remanufactured cells and in-house rebuilds include a 12-month warranty against defects and workmanship -- no lemons, no fine-print games.

For longer peace of mind, we offer extended warranties of 1, 2, 4, and 5 years on most hybrid batteries, with coverage up to lifetime. Our Hybrid Club lifetime warranty is available for $29.99 per month. Contact us for the warranty package that fits your vehicle and budget.

In-House Rebuild vs. Mobile Replacement: Two Paths, One Expert Team

Every hybrid battery failure is different, which is why we offer two distinct solutions.

In-house rebuild: We remanufacture your existing battery at our Arlington facility -- replacing failed modules, installing a new OEM wiring harness, cleaning the cooling system, and balancing the pack. You keep your original equipment, and the work is backed by our 12-month warranty with extended options up to lifetime coverage.

Mobile replacement: When a rebuild is not the right call, our mobile team comes to you and installs a replacement pack -- either a certified refurbished battery or a new OEM unit -- at your home or workplace. You get back on the road without arranging a tow or a shop visit, with warranty options to match.

Not sure which path fits your vehicle? We will diagnose your battery and give you a straight answer. We never recommend replacement unless it is truly necessary, and we never push a rebuild when a replacement makes more sense.

We use NEW OEM wiring harnesses from your vehicle manufacturer. Our service includes full diagnostics, a new OEM wiring harness, cleaning of the hybrid cooling system, replacement of failed hybrid battery cells, a 22-point vehicle inspection, and a 12-month warranty.

We repair your existing hybrid drive battery at a fraction of the dealership cost. We have seen instances where dealerships -- as well as other hybrid shops -- have misled customers, claiming a healthy battery needed replacement. We will NOT replace a battery unless it is truly necessary. We verify your battery genuinely needs repair or replacement before any work is performed, and we pride ourselves on outstanding communication with our customers. In some cases, diagnosing the vehicle may require a new auxiliary (12-volt) starting battery. Only OEM-approved auxiliary batteries made specifically for your hybrid should be used -- do not use any other 12-volt starting battery. AGM batteries are preferred on many hybrids.

All hybrid battery rebuilds include a 12-month warranty valid exclusively through PNW Hybrid LLC. The warranty covers hybrid battery cells and labor. It is void if the battery is tampered with, opened, or damaged by accessories such as aftermarket stereo equipment, a failed inverter, or a vehicle collision.