I have a cordless drill using NiCad bateries. They died a few weeks ago and last week I got two new batteries.
I fully charged one, used it and waited till it was fully drained, and started charging again...STUPID ME, I forgotten about it and left it in the charger for a full week and didn't realized it until today!!!
I heard that if you left your battery in the charger after it has been fully charged it will create the memory effect again, is this right? Did I ruin this new battery by my dumbness again?
One other related question, my cell phone uses a lithium ion battery. I have a car charger and a regular charger. My friend told me I should avoid charging with the car charger as much as possible because they create memory effect on the battery. Is this true? I could not find any online references for this.
Thanks in advance,