On 12/28/2013 05:43 AM, matt lacey wrote:
Hi Buddy,
are these cells brand new - never used?
if so, they are already at 50% soc - they come from the factory like
that after the capacity test and sort process
just store them as is - they don't discharge (I have cells that have
been in storage for 3 years that are all still exactly 3.30v)
I generally agree. They come about 50% charged. There is no practical
way to determine state of charge without cycling them. Which is not very
practical. I have not had cells go bad from being stored several
years. I've been tempted to connect them in parallel and put a small
charger and a single bypass module on them. I'm sure they do self
discharge, it just seems to be not very significant. Apparently, it is
less than the generally advertised rate of 1% per month.
I think it is safe to store them for 3+ years without replenishing the
charge.
OTHO, I have had cells go bad after being stored in a car for only a few
months with the BMS modules active.
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