How to disconnect a BMS to protect the battery

[liared]

I will order a Lifepo4 36 20 AH from a vendor from China (sun-thing). I have read that air freight of batteries is not working good from China these days so I will choose sea transport which will take 7-8 weeks or more to Europe.
I have read that the BMS should be disconnected if recharging can´t be done within a month.
I figure that the contact(s) on the BMS for the sense wires shall be disconnedted. Shall also one thick wire connecting the BMS to the battery be cut off (will be reconnected again when battery arrives and can be recharged).
Will this stop the BMS draining the battery (2 actions) or would one of the actions be enough?

(moderator edit: moved this to your new thread out of someone else's unrelated thread. Please do not use other people's unrelated threads for your questions, and please do not post multiple times for the same question. Be patient and wait for people to answer you.)

 

[liared]

I am about to order a Lifepo4 36 20 AH from a vendor in China (sun-thing). I have read that air transport of batteries is not working good from China these days so I will choose the battery be transported by sea which will take 7-8 weeks or more to Europe.
I have read that the BMS should be disconnected from the battery if recharging can´t be done within a month.
I figure that the contact(s) on the BMS for the sense wires shall be disconnedted. Shall also one thick wire connecting the BMS to the battery be cut off (will be reconnected again when battery arrives and can be recharged).
Will this stop the BMS draining the battery (2 actions) during sea transport time or would one of the actions be enough?

 

[dnmun]

we do not know this BMS yet. most of the BMSs use voltage from the entire pack to supply the circuit current to drive the BMS. if that is the case with this pack then it should be safe even if they leave the sense wire plugged in. you don't have to cut any wires in any case.

for the ping signalab BMS, the circuit current is taken from the top 4 cells so if left uncharged for a long time the first 4 cells can be discharged a lot, but li ping disconnects the BMS at the sense wire plug before he ships.

 

[dnmun]

i answered this on the ping led thread. no need to do anything, it will most probably be ok.

 

[dogman dan]

Just disconnecting the sensor wires should cause the lvc on the bms to shut off, so you wouldn't need to disconnect the main wires.

Don't those bms's run on just the first one or two cells? Haven't there been sea shipped, and stored batteries killed by bms's in a few months?

Which ping thread, isn't there at least two discussing the shipping problem?

 

[arkmundi]

Can you get your vendor to ship the whole package as a kit, to be assembled by you on arival? Might save some cost that way and you'd have control over workmanship making the connections. Also, DHL is shipping li-ion just fine, ariving in the USofA in 3-5 days. How I got my Victpower cells.

 

[kriskros]

with ping and cellman batteries there is a multi pin plug connector between the battery and the bms.... just disconnect the plud foe long storage.... i have left my cellman battery in storage for almost 5 months with very little drop in voltage.... leaving tjr battery and bms connectef the voltage will drop very quickly the bms is constantly balancing the battery and so is drawing a small curent