LLT SmartBMS killed my battery.

[Static]

That kinda sucks. I guess you could put the pin 12 on the loop key as well? Which pins are powering it?

[fessyfoo]

i believe it’s the first and last balance lead i ran it powering those two leads to grab the settings.

[Battery_Mooch]

@fessyfoo

i believe it’s the first and last balance lead i ran it powering those two leads to grab the settings.

At least that’s the right way to do it (or via the main leads). The BMS’ that tap off power from the third cell (or wherever) just force the pack to become unbalanced and make the BMS work like crazy.

[fessyfoo]

@Battery_Mooch

The BMS’ that tap off power from the third cell (or wherever) just force the pack to become unbalanced and make the BMS work like crazy.

Yah my lipo alarms power from the first 2 cells, and i discovered the imbalance once when i accidentally left them attached for a week. annoying for sure.

[fessyfoo]

@magharees

Ps. This BMS is pretty cool but so far it seems to leech quite a lot of juice. You can set it up to give notifications via the app and BT but the chances are the low voltage condition would likely be due to its use, a lithium battery can keep a storage charge for many months, this would critically drain a pack over a couple of weeks.

heh. the warnings out there 2 years ago.

[fessyfoo]

@vegr0

been monitoring my lacroix thats been out of service for 5 months with the cells at 3.8 . Hasn’t moved at all for me to notice. I think if your phone was fully connected to the bms (aka blue light lit up) then maybe over time there would be some drain on a small pack

another observation in the wild.

[magharees]

Bigger pack less problem. Turning off ports & balancing except when charging helps

[DeuceDos]

Does anyone know if they can be turned off using the plug with the black and red wire that come with it? Do you just close the loop?

[glyphiks]

The switch only controls discharge on/off

[DeuceDos]

Is it better to short the wires? If not using discharge? Is there a way to turn off the bms completely when the board is stored for a while?

[glyphiks]

Not without unplugging it. I leave the switch wires off and just leave it open

[DeuceDos]

Will a XT30 loop key on the B- turn it off?

[DeuceDos]

So if the switch on the BMS turns off the discharge, can it be used to power the board on and off when using discharge?

[glyphiks]

@DeuceDos

Will a XT30 loop key on the B- turn it off?

I wouldn’t recommend this. A lot of bms need the main b- connected, and bad things might happen if that connection is cut.

@DeuceDos

So if the switch on the BMS turns off the discharge, can it be used to power the board on and off when using discharge?

Absolutely.

[DeuceDos]

Thank you, I appreciate your input. I’m wiring my pack now. This bms takes up a lot of space and I can’t decide if I want to go with Focbox Unity or VESC 6.6. I have both but not sure which one is better.

They should make a charge only smart bms, I asume it would be smaller without the discharge components.

[Sharky]

Guys i also have the issue tht after a long time of use my battery pack (16s5p) only has 2v left of power. Even my smart bms with bluetooth isnt recognized any more as the voltage is too low. I tried to liad the pack but its not liading as the bms has too low voltage i think
Is there anything i can do??
Kr and thx vor any help

This is the bms

[frame]

@Sharky

Is there anything i can do??

get a new pack made if ur battery is only at 2v, that pack is dead already and u SHOULD NOT try to revive it

[PedroMcJimenez]

@frame

SHOULD NOT try to revive it

To reiterate, do not, this is a fire waiting to happen if attempted revival.

[iNoLikeFlexyDecks]

@PedroMcJimenez

revival.

===

[Sharky]

Ok think ill build a new pack then with the new molicell 45b
And a switch to turn off the bms