Headed out to fire up Blue for a quick afternoon ride before pulling the forks. Machine has been in an unheated garage for +/- 90 days. Pressed in the key AND nothing; no dash, no clockwork, nadda = 
…
Hooked up the Li-ion specific charger to the battery port and the charger did not recognize a battery was on the other end or the battery’s Battery Management System (BMS) was in protection mode.
Pulled battery to find it was reading 8.6V
. The battery was supposed to resist cold storage discharge and not require a constant trickle, hmm, lesson learned there.
In a previous life I have used Li-ion batteries extensively and I am aware that a sleeping cell can ruin the battery’s ability to revive, balance and store a charge. They are not as volatile as made to sound, however, care is needed.
Next is completely AT YOUR OWN RISK however will share what I’ve done to revive the battery. Again this is for a Li-ion battery that is not totally dead - such as key or headlights left on for extended periods. Again the BMS is supposed to shutdown to protect overdraw and death of the battery but still use care here. This is only meant for use with a moderately over-discharged battery such as this where the battery is still reading a voltage, albeit not near what it should be.
To get a proper Li-ion cell balancing charger and battery’s BMS to work you need ~ 3V per cell. To achieve minimum voltage for a cell balance check I hooked up a lead-acid trickle charger to obtain 12.2 volts (3 minutes) then switched over to a proper Li-ion charger to obtain a reading of all cells’ health. All passed and battery is now charging at full charge with the balancing technology of the BMS and Li-ion charger working.
Will know very quickly, then long term ill monitor. I am slightly pessimistic over the battery’s capacity due to the excessive drain down to 2.15V / cell and the requirement we have of a high draining starter... Will provide an update.
Wayne
… Hooked up the Li-ion specific charger to the battery port and the charger did not recognize a battery was on the other end or the battery’s Battery Management System (BMS) was in protection mode.
Pulled battery to find it was reading 8.6V
. The battery was supposed to resist cold storage discharge and not require a constant trickle, hmm, lesson learned there.In a previous life I have used Li-ion batteries extensively and I am aware that a sleeping cell can ruin the battery’s ability to revive, balance and store a charge. They are not as volatile as made to sound, however, care is needed.
Next is completely AT YOUR OWN RISK however will share what I’ve done to revive the battery. Again this is for a Li-ion battery that is not totally dead - such as key or headlights left on for extended periods. Again the BMS is supposed to shutdown to protect overdraw and death of the battery but still use care here. This is only meant for use with a moderately over-discharged battery such as this where the battery is still reading a voltage, albeit not near what it should be.
To get a proper Li-ion cell balancing charger and battery’s BMS to work you need ~ 3V per cell. To achieve minimum voltage for a cell balance check I hooked up a lead-acid trickle charger to obtain 12.2 volts (3 minutes) then switched over to a proper Li-ion charger to obtain a reading of all cells’ health. All passed and battery is now charging at full charge with the balancing technology of the BMS and Li-ion charger working.
Will know very quickly, then long term ill monitor. I am slightly pessimistic over the battery’s capacity due to the excessive drain down to 2.15V / cell and the requirement we have of a high draining starter... Will provide an update.
Wayne
