Nimh or Nicad at 1.2v is actualy 99% discharged, Charge can be 1.35 -
Leaving any battery in a charger is a risk. Excess voltage converts to
heat. Companys make their big money on batteries, Nicads and Nimh are
not like Lead Acid. Storage is best discharged, Cycled , once a day
and not charged or used hot. I have 20 yr old Makita packs that still
work. A good peak charger is best ,cheap constant volt chagers are
damaing a cell once it is fully charged if it continues to charge. Once
a batterys voltage starts to drop while you are charging it , its fully
charged and converting energy to heat , damaging the cells structure at
cellular level. Use a voltmeter to see.
NiCd and NiMh have a similar discharge profile. Immediately after
charging they will be around 1.4v, but under load quickly drop to 1.2v
and then drop very little until almost completely discharged. Fully
discharged is considered to be 1.0v +/-, depending on the application
and the battery.
Roger Grady firstname.lastname@example.org
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