• Battery charging

Tech: How do Hybrid & Plug-in Hybrid Batteries Recharge? Do I Need to Plug a Hybrid In?

A Primer on Hybrid Battery Care

When the first gasoline-electric hybrids vehicles began arriving in 1999 and 2000, early adopters did their research and were quite knowledgeable about the then-new and revolutionary transportation mode.

But the mass market was confused; these new cars had an additional battery to provide electricity to an electric motor. For the uninformed, the question was: Does the battery need to be plugged in to be charged?

Hybrid & Plug-in hybrid batteries

When hybrids appeared most used nickel-metal-hydride batteries

This question was such a big roadblock for increasing sales that Toyota began an advertising campaign for the Prius that clearly emphasized that plugging in was not necessary. Just occasionally fill up the gas tank and drive away.

Fast-forward about 10 years and a new type of hybrid came on the scene—the plug-in hybrid, and it does require plugging in to charge the onboard battery to maximize efficiency (without plugging in it functions like a normal hybrid).

So, what’s the difference between the two different types of hybrid vehicles? Here’s a brief overview.

Regular Hybrid

Regular hybrids recharge their onboard nickel-metal hydride or lithium-ion battery packs by reclaiming energy through a process called regenerative braking. During coasting or braking, the electric motor that drives the wheels is electrically operated in reverse and acts as a generator. It takes with kinetic energy that would normally be lost as heat through traditional mechanical friction brakes and stores it as electric energy in the battery.

In addition, when in the generator mode, the internal combustion (usually gas) engine charges the battery pack.

Plug-in Hybrids

Hybrid & Plug-in hybrid batteries

As bigger batteries were needed for plug-in hybrids, lithium-ion has become the battery of choice

Regular hybrids can be driven short distances at speeds up to 40 miles on battery power alone, but plug-in hybrids can drive, depending on make and model, anywhere from 15 to 53 miles using only electricity. This is accomplished by using a much larger, more powerful lithium-ion battery pack. But it needs to be plugged in to an electrical outlet to maintain the electric-only range.

This feature allows the vehicle to perform like a pure electric car and less like a conventional gasoline car, all the while delivering exceptional fuel mileage.

As for plugging in to charge the battery, there are four options:

  • Standard 120-volt household outlet with a charging time of three to eight hours, depending on vehicle.
  • A 220-volt home charging system cuts charging time by half or more.
  • Public charging stations times are equal or less than 220-volt home charging systems.
  • Fast-charging with a DC charger (with compatible vehicles) can cut the charge time to a half hour or less.

Plug-in hybrids provide most of the benefits of an electric car, while maintaining the efficiency and driving range of a regular hybrid, which eliminates the “range anxiety” of pure electric vehicles. Plug-in hybrid drivers can travel in an all-electric mode for the vast majority of typical local driving. When the battery’s electric charge is depleted, the conventional hybrid system powers the car until the next opportunity to plug in and recharge the batteries.

There are choices now in the hybrid world and the buying public is learning to live with both types.

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First Drive: 2016 Toyota Prius Hybrid


Smarticd is loaned free test vehicles from automakers to evaluate, typically for a week at a time. Our road tests are based on this one-week drive of a new vehicle. Because of this we don’t address issues such as long-term reliability or total cost of ownership. In addition we are often invited to manufacturer events highlighting new vehicles or technology. As part of these events we may be offered free transportation, lodging or meals. We do our best to present our unvarnished evaluations of vehicles and news irrespective of these inducements.

Our focus is on vehicles that offer the best fuel economy in their class. We also feature those that are among the top mpg vehicles in their class. In addition, we aim to offer reviews and news on advanced technology and the alternative fuel vehicle market. We welcome any feedback from vehicle owners and are dedicated to providing a forum for alternative viewpoints. Please let us know your views at [email protected].

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About Author:

Larry E. Hall is the Editor-At-Large at Smarticd. His interest and passion for automobiles began at age 7, cleaning engine parts for his father, a fleet manager for a regional bakery. He has written about cars and the automobile industry for more than 25 years and has focused his attention on “green” cars and advanced technology vehicles. Larry’s articles have been published by Microsoft’s MSNBC.com and MSN Autos as their alternative vehicles correspondent, and is currently the Senior Editor at HybridCars.com. His work has appeared in metro and suburban newspapers as well as business publications and trade journals. He is the founding president of the Northwest Automotive Press Association and a member of the Motor Press Guild. Larry lives and drives in Olympia Wa. with his wife, Lynne, who shares his passion for cars.

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