> I see online that the MiniBMS idle current is 2.2ma.
Depends on the version of the MiniBMS. The early "analog" models
(original and v.2) that use the LM239/339 comparitor chips typically
have a quiescent current of about 6.5mA. Individual modules can have
a current draw of up to 9mA. These older modules are more than happy
to draw the battery down until its empty, as they have no low cell
voltage shutdown.
The v.3 modules, with the ATTiny 85 AVR processors have low battery
"sleep" programming, but it would only come into play when the cell
it is connected to is nearly empty. The point is that this gives a
limited grace period to find and correct problems before reaching 0% SOC.
Denis mentions "seeing green lights", so his MiniBMS system is the
early analog version, the v.3 modules have a single blinky red LED
for indication of all functions.
> 4.5 amp hours per month, which doesn't seem like
> it'd be enough to run the battery flat over a winter
I did similar calculations, and if the pack was adequately charged
when put into storage, the BMS modules shouldn't have drawn it down
to completely discharged.
> I think that the first step is to see where you stand
Agreed. Having to "drop the pack" for maintenance and
troubleshooting, even as little attention as Lithium requires, makes
keeping up with things like this difficult, with the result being ...
well, things happen.
All of which reminds me that I need to go out and pull the cover off
my pack and do a balancing charge on my Thunderskys. Full manual
control comes with responsibilities.
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