The Li-ion Pack has 4 18650 lithium-ion batteries with a soldered Balancer and XT60. On my ISDT charger, the read out voltage for each battery cell is:
Whenever I try to charge the Li-ion Pack, I get:
My Question: How can I bypass this using my ISDT charger?
Note: This answer does not consider whether this is a 'good idea', as there can be safety concerns with over-discharged lithium batteries (e.g. see this question.)
I aim here to address the 'how' of the question, but you must decide if you consider the risks acceptable (for this battery, or others in the future) and follow all the usual charging safety measures.
It looks like the charger in question supports unbalanced charging, so you may be able to set the battery to charge in unbalanced mode which should ignore the per-cell voltage. In this case, I would set the charge current as low as possible and charge somewhere very fireproof - in case the low cell voltage has caused damage - and plan to stop the charge once the faulty cell has exceeded about 3.1V. You should then be able to try balance charging again.
However, the charger may check the sum of the individual cell voltages for the unbalanced charging mode and could therefore still decide that the total voltage is too low.
