Batteries - Why Does Charging Slow Down?

[Ian J.]

A question:

 

Why do batteries slow down in taking in charge when they are becoming full, say once they are over 80%?

[57xx]

Depends what sort of battery you are talking about and the type of charger. 

[jonny777]

Because the potential difference across the battery terminals lessens as the charge continues.

 

I believe that certain chargers are fitted with a device that detects this and at a certain level (80%) switches to a low (trickle) charge for safety reasons.

 

As you can tell, I am not an electrician.

[BoD]

I'm sure there are rules, laws and maybe even some diagrams to explain this but isn't it down to the fact that the fuller they get the harder it is to push more in.

 

But like blowing up an air bed really.

[TheSignalEngineer]

Some explanations of the charging process here http://www.mpoweruk.com/chargers.htm

[Ian J.]

Some explanations of the charging process here http://www.mpoweruk.com/chargers.htm

 

Thanks, I'll check that out tomorrow when my mind is a bit fresher from a night's sleep.

[Butler Henderson]

If you have not already got one worth investing in a charger that charges each battery individually such as this one . Lidl also have one on sale from Monday which seems to do them individually if I have read its details right