Friday, December 29, 2006

Those silly little things ...

Most cars today have some form of radio frequency based remote keyless system for locking / unlocking a car.

Many of these use small internal batteries within the fob, which need to be replaced when they run down.

Why?

The key is connected to the ignition when driving, the car has a walloping electricity generator and a battery to boot. Can't these key batteries be recharged whilst driving?

grumble, grumble...

2 comments:

Mark said...

My guess would be that the 'charge once' batteries last a stupidly long time, in the period of years. Rechargable battery technologies such as Li-Ion stop working after three years reguardless of charge cycles. Maybe some other rechargable battery tech could be used however...

swardley said...

It's a minor point, but it just seems to be one of those annoying design issues - especially since a car is basically a large power generator.