Usually gradually-- hold less and less of a charge-- but if some
catastrophic failure occurred (broken wire, etc.), DOA could occur...
Good news is batteries are cheap. FWIW, I've not had good luck buying after
market batteries. If I had to replace my battery, I'd buy OEM-- though
probably not directly from the carrier unless I needed it yesterday.
happened to me too........
fine one moment dead the next.
my one year old die hard gold battery did the same thging in my van. I
came home all was well, 15 minutes later the nearly brand new batytewr
was stone dead,
I noticed that the lithium ion batteries for my drill died suddenly which I
attributed to excessive heat from me pushing those things too far. The
NiCads take the punishment. I don't know if the same thing could happen
with a cell phone.
They tend to get unstable with age. They can appear to be fully charged
and be dead in an hour. They can also appear to get a full charge in a
very short time. They also discharge rapidly when using the phone. Other
times they act normally.
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