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I'll start by saying that I'm quite comfortable with electronics and hardware hacking, and I'm hoping to be able to reuse as many components of my salvage car as possible. The car is a 2015 Spark EV 2LT with a severely degraded battery, and is structurally damaged enough that it's not worth repairing. My other car is nearly identical and functioning, if I have to do any CAN sniffing later on. What I'd like to do is use Tesla modules with as much of the Spark guts as I can to get a working drive train. I'm worried about the Chevy hardware's built in battery parameters, as I don't know which computer controls charge rate, max voltage, min voltage, etc. From what I can tell, these cars are very similar to the Volt and Bolt (why spend much on engineering a compliance car) and with both of them being fairly well documented by now, I figure someone knows how to hack these systems and I can save myself the pain of spending days sifting through CAN data or dumping firmware off of ECUs.
 

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... I'm worried about the Chevy hardware's built in battery parameters, as I don't know which computer controls charge rate, max voltage, min voltage, etc. From what I can tell, these cars are very similar to the Volt and Bolt (why spend much on engineering a compliance car) and with both of them being fairly well documented by now, I figure someone knows how to hack these systems and I can save myself the pain of spending days sifting through CAN data or dumping firmware off of ECUs.
There's not much similarity between a Spark EV and a Bolt; while the Spark EV was a Spark with as little changed as possible to make it an EV, the Bolt is on its own platform. The Volt is a hybrid, on yet another platform. What is likely most transferable between these models is the software approach, so for what you're looking for some of the Volt and Bolt information might actually apply... even though the cars have little if any common hardware.

The later Spark EV battery used the same series of LG Chem modules as the Volt, which might help.
 

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What I'd like to do is use Tesla modules with as much of the Spark guts as I can to get a working drive train.
Why Tesla modules? If you string enough of them together to reach the design operating voltage of the Spark EV, you'll have a pile of 16 modules weighing 325 kg (825 pounds)... which the car may not even be able to carry. Why not use modules from another small EV or even plug-in hybrid?
 
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