Variable Voltage battery charger for nicads and nimh? Answered

I would like to build a charger wherein I could specify up to what voltage to charge my nicads and nimh batteries. I'm currently using a la crosse bc-700 smart charger. it usually charges my batteries to 1.44-1.46v. I would like to build a charger that will cut off, say 1.38v.

Is that possible?

Thanks.

Tags:battery charger variable voltage

Discussions

iceng

6 years ago

A comparator op-amp can easily be set to turn the charge off at any exact voltage

or better yet use two LM317s one as a voltage limit and one as the current limit.

NotaryBlue

Answer 6 years ago

You are a Legend that is the simplest schematic I have seen, thank you I am going to use that.

NotaryBlue

6 years ago

I have to agree with Josehf doing so will simply reduce the lifespan of the cell. your current charger is a nice little beast.

mpilchfamily

6 years ago

Are you saying you want to build a charger that will charge the batteries at 1.38V or do you want to cut that 1.38V from it so it's only charging at .06V?

You do realize reducing the charging voltage will prevent the charger from being able to charge the batteries.

Josehf Murchison

Answer 6 years ago

I think they want to charge at 1.38 Volts.
Why so precise I don't know why.
Since batteries and other are built to a tolerance.

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Variable Voltage battery charger for nicads and nimh? Answered

Discussions