The components of NiMH batteries include a cathode of Nickel-hydroxide, an anode of Hydrogen absorbing alloys and a Potassium-hydroxide (KOH) electrolyte. The energy density of NiMH is more than double that of a lead acid battery but less than lithium ion batteries.

In 1997, Toyota developed a cylindrical NiMH battery that powered the Rav4EV as well as the e-com electric vehicle. Since 1997, Toyota has continually improved its NiMH batteries by reducing size, improving power density, lowering weight, improving the battery pack/case and lowering costs. In fact, the current NiMH battery, which powers the third generation Prius, costs ¼ that of the 1st generation.

Nickel-metal batteries are ideal for mass producing affordable conventional hybrid vehicles due to their low cost, high reliability and high durability. There are first-generation Prius batteries still on the road with over 200,000 miles and counting. That is why NiMH remains the battery of choice for Toyota’s conventional hybrid line up.

  1. 3rd Generation Prius Ni-MH Battery.

  2. 3rd Generation Prius Ni-MH Battery.

  3. 3rd Generation Prius Ni-MH Battery.

  4. 3rd Generation Prius Ni-MH Battery.

  5. 3rd Generation Prius Ni-MH Battery.

  6. 3rd Generation Prius Ni-MH Battery.