Re: Anybody with 2011 or 2012 interested in upgrade to new battery?
Posted: Mon Jul 31, 2017 11:17 am
Valdemar wrote:Do you know if any 2013+ 24kWh battery can be installed in a 11/12 Leaf with a dealer reprogramming (with the necessary adapters) or only the ones that were originally fitted into 11/12 cars as warranty replacements? Which was it in your case?
Ah, good question.
Till date I have only installed a complete battery that was made for a 2011/2012 into those Leafs, even when manufactured in 2017, the batteries for old style Leafs have a different control connector and also still appear to have 4 physical temp sensors, whereas newer Leafs only have (and expect) 3 temp sensors. So, even though it would be trivial to simulate the 4th temp sensor in software, the new battery pack for old Leafs is still equipped with the correct nrof temp sensors.
I heard from others (have not tested it myself) that if the temp sensors are not present, the BMS will not balance the pack, so I made sure
to install the temp sensors.
BTW, I checked the new BMS (with colored connectors) and no matter if it its intended for new or old pack, it still has all 4 temp sensor inputs present, apparently the change for new packs is simply not to wire the 4th sensor and the software to ignore the missing reading, but the software for the new BMS that goes into the old Leaf is expecting 4 temp sensors.
So, I am expecting that you can't take a new pack intended for a new Leaf and mount it in an old one, even if you found a way to hack up the control cable to fit into the new socket from the old style plug on the old Leaf, the missing temp sensor is likely going to upset the Leaf, although I have no tried it, it might work but throw error code(s). Just like I was successful in letting the dealer program a 4-button FOB for my 2012 even though the car expects a 3-button one. But I have a permanent error code stored about this "incompatible" remote. I just had only this remote handy and I like to have 2 keys to every car I own (I bought a blank physical key and had it cut, so it is complete)
The safest way to use a 2013+ battery in a 2011/12 Leaf is to swap modules.
BTW, if you think of changing the control connector on a battery, please note that the connector can only be installed from *inside* the battery, even though you can unbolt the alu flange that the connector is installed into, from the outside of the shell, the high voltage pins from the power connector and the "connector inserted" detection cable cannot be disconnected from outside the shell. And the shell is glued shut.
I still want to get my hands on a 30kWh battery and verify that modules from that battery can swap into an older Leaf, I see no reason why that would not work, but have not verified it yet.