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Why do Electric Shavers Make Heavy use of Ni-MH Battery?

Mar. 11, 2020

Now that lithium battery technology is so developed, why do electric shavers and electric toothbrushes use Ni-MH Battery in large quantities? As a Ni-MH Battery Packs Wholesaler, share with you.

Ni-MH Battery

Ni-MH Battery

1. Cost problem

The Ni-MH Battery used in the shaver is a mature Ni-MH battery that has been produced for more than ten years. After a long period of production, it can now achieve a relatively low cost. Although lithium batteries are cheap, they are still more expensive than nickel-metal hydride batteries.

The important parts on the shaver are the motor and the cutter head. The motor is more sensitive to the current. The voltage and discharge characteristics of lithium battery and nickel metal hydride and nickel cadmium are different. When you produce, older motors either have mature production lines or have sufficient suppliers, which is cheaper. If you change a new battery, you have to replace it with a new motor. However, whether you design or produce the new motor yourself, it should be a lot more expensive than the original motor, so the cost will rise a lot.

2. Other issues

Mobile phones and other electronic devices need to be thin and light. The battery can be repeatedly charged, fast charged, stable voltage for a long time, and low self-discharge. These are the discharge characteristics required by electronic devices. Some of these characteristics of nickel-metal hydride batteries can not be done, and some are more expensive, so these electronic products are not suitable for nickel-metal hydride batteries, suitable for lithium batteries.

The shaver needs a relatively short-term power current. This nickel-cadmium battery does a good job, but cadmium is toxic, so it is not necessary. Ni-MH batteries can do the same. There is no need for more expensive lithium batteries. And in products such as razors, the current is relatively large, it is easy to heat, the lithium battery is easy to burn, and the explosion is potentially dangerous. It is also necessary to prevent overshoot when charging and prevent overdischarge when discharging. Protective measures must be designed for these situations. NiMH batteries do not have these concerns.

There is also a beard that does not grow very long for 10 hours. Slowly charging the electricity does not make consumers dissatisfied with the product. Quick charging for 1 hour is not an attractive buying point for shavers.


1. Lithium battery is the more stable voltage during discharge.

2. The research progress of nickel-metal hydride batteries is very great. Nickel-metal hydride batteries are not inferior to lithium batteries in many indicators, and some are even better. Lithium batteries have been developing a bit slowly recently. So NiMH batteries are not backward batteries.

Our company also has China LiFePO4 Battery Pack on sale, welcome to consult.

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