From page 259 of owner's manual of Bolt EV: https://my.chevrolet.com/content/da...als/2017/Chevrolet/BOLT EV/Owner's Manual.pdf
Code:
Four Weeks to 12 Months
. Discharge the high voltage
battery until two or three bars
remain on the battery range
indicator (Battery symbol) on the
instrument cluster.
. Do not plug in the charge cord.
. Remove the black negative (−)
cable from the 12-volt battery
and attach a trickle charger to
the battery terminals or keep the
12-volt battery cables connected
and trickle charge from the
underhood remote positive (+)
and negative (−) terminals. See
Jump Starting - North America
0 295 for the location of these
terminals.