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The pack is a ~54V pack. There are 32 life cells rated at 39Ah. They are in a 'buddy cell' setup where each cell is in parallel with another, and those two are in series with the next two.
There is a 15A AC charger for charging the ~4kWh of batteries. Then there is a 54 to 240V boost converter to charge the OEM pack.
The BMS is my design. Its pretty simple too. The celllogs are a purchased item and they monitor the voltage of each cell. They have a user set low and high voltage alarm. The celllog also have an alarm port so it can send a signal in my case to an arduino. When I get that alarm signal, I'm using a SSR to cut power to the AC charger. In time it will also be used to shut down the boost converter.
The clicking is a relay in the AC charger.
Currently there are no provisions for heating the kit. The only provisions for cooling are fans in the kit. The boost converter has two smaller (60mm I think) internal fans that I think always run when the kit is turned on and even after its turned off for a while. In addition there is a 120mm fan on the case that exhausts hot air. It still gets warm if the car is hot, but the dc to dc converter also reduces power output if it gets too warm.
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