I remember reading about a device that you can plug into a leaf back
(bare, taken out of a vehicle) and it would allow you to read the BMS
data directly. Don't remember if it would control the contractor or not,
but that sounds like something it could do.
Dala's EV Repair developed tools and documentation to bridge the battery
connector directly to an OBD2 port, specifically for testing used packs
or battery upgrades.
https://github.com/dalathegreat/Nissan-Leaf-Battery-to-OBD2
Or you can just buy a test cable to connect it to a OBDII / LeafSpy:
https://www.aliexpress.us/item/3256806829324768.html
Jay
On 3/23/26 16:08, John Lussmyer via EV wrote:
So, I know this exists somewhere, but I can't find it.
I'm looking for a thing that will plug into a Leaf Battery pack, and let
me read all the cell status information.
I'd also like to be able to control the contactor so that I can charge/
discharge the pack.
Anyone know where I can find the above device(s)?
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