Hybrid Vehicle Battery Swap

Afraid you’ll be looking at huge bills when your hybrid vehicle’s battery goes bad? Not anymore. At Hybrid Battery Swap, we can recondition most hybrid cars’ batteries so they work as good as new. Even if your original battery is beyond repair, we can replace it with a reconditioned original battery from your car’s maker.

How Battery Problems Start

Your hybrid vehicle’s battery pack contains anywhere from 28 to 40 nickel metal hydride (NiMH) modules assembled in a series. These modules each contain six individual 1.2-volt cells (about the size of a D flashlight battery) made of the same material, also assembled in a series.

Since your car uses these modules to assist power production, their depth of discharge is shallow—less than 10 percent. That causes the unused electrode material to develop a resistive barrier. That reduces its amp-hour capacity. Called the memory effect, it causes the modules to become out of balance with the others.

NiMH batteries discharge more when not in use. After about a week of not being used, a fully charged NiMH battery will have lost about 20 percent of its charge.

What Does "Out of Balance" Mean?

“The driving cycle of your HEV battery modules allows a shallow discharge that only utilizes about ten percent of the battery's capacity. The unused material in the electrodes becomes separated electronically, making it unavailable over time. This module-to-module variation of the battery's amp-hour (Ah) capacity, called "reversible failure mode," causes the battery pack to become out of balance. You may also hear this called the "memory effect."”

What Is Battery Cell Balancing?

The cell balancing process (CBP), also called "reconditioning," is a five-step process. We:
  1. Remove the high-voltage cable
  2. Connect the modules in parallel to a charge-discharge system
  3. Quickly identify and switch out high-resistance modules (e.g., those with less than ten mΩ for a six-cell module)
  4. Subject the modules to deep, split-current cycling (the CBP)

Cell balancing must occur with the modules in parallel because we cannot control individual module voltages when they are connected in a series.

All This
Plus a Warranty

We offer our customers a warranty based on the condition of their battery cells. As soon as we finish the reconditioning process, we extract a summary report from the computer that calibrates the reconditioning. That report tells us the quality grade of the battery’s cells. Each grade qualifies for a certain length of warranty. Here’s the rundown:


  • Grade A cells – 3-year warranty
  • Grade B cells – 2-year warranty
  • Grade C cells – 1-year warranty’
  • Grade D cells – 6-month or 6,000 miles warranty
  • Grade E cells – 30-day warranty

*Note, though, that driving habits affect your battery life. The warranty is based on the grade of the cell, but your driving habits, such as frequency of use, will affect how long and how well your battery will work. For instance, if you have a 30-day warranty, that doesn't mean that your battery will go bad in 30 days. It could last much longer than that, depending on your driving.

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