Chevy Spark EV Battery Teardown UPDATE. Modules charged and load tested.

[@MrTeff999]

We love our 2015 Spark EV. Now after 70k miles it has lost about 20 to 25% of its original range. Seeing your batteries out of the car removes some of the mystery. I wonder, could they be replaced with off-the-shelf LiFePo4 batteries?

[@edsgarage2.0]

@@MrTeff999 possibly... But the battery management system would have to be completely reprogrammed.

[@mpirron1]

You need to look up the specs of the battery and determine what the cutoff voltage is, you don't want to discharge a battery cell below cutoff voltage.

[@edsgarage2.0]

@@mpirron1 already done. 😊

[@DoctorHemi]

So, do you have a guess as to why the original Spark EV wouldn't allow a recharge? It seems like, although the batteries did degrade and the vehicle's range shrunk accordingly, the real "failure" is that something in the car (ECM? BCM?) wouldn't allow the batteries to be recharged.

[@edsgarage2.0]

@@DoctorHemi because module 6 was more degraded then the other 5 causing an imbalance larger then it's safe limit.

[@DoctorHemi]

@@edsgarage2.0, gotcha. Thanks.