LOL…yea, pretty crazy stuff.
Luckily there’s no metallic lithium in our rechargeable cells as they are bad enough already if they catch fire. But the non-rechargeable lithium-metal cells can catch fire (like ours) AND they have metallic lithium in them.
5 Likes
So you would have 2 seperate batteries with their own bms and then connect the 2 batteries together with another bms?
Sounds sketchy to me.
2 Likes
No i would link the two
I’m not following.
Parallel batteries can be extremely dangerous. If you are unsure or unaware of the risks involved, I would recommend that you don’t do it.
3 Likes
Yes they can be, and im not unsure or unware, im asking the community as one does what the best precuations are so like you say I dont hurt myself in a way i hadnt thought of.
I was saying charge the batteries as one. Install a higher amperage battery management system that takes care of of both packs(one pack at this point)
At that point you may as well dismantle the batteries and turn them into one battery.
3 bms for one battery sounds like a bad idea.
1 Like
I wasnt suggesting 3. I mean take the 2 out and replace with 1.
Right, that sounds more reasonable.
I suppose in that circumstance I might be concerned about the parallel connections between the individual groups.
I’d be tempted to join each individual group together with something a little more substantial than balance wires.
2 Likes
Okok I thought about that as well lots of work though. Just outta curiosity why can i pop 2 cells in a box mod that are random and different voltages and it still works.
One final question as I will likely either keep both bms or use one or use charge only on both. But either way where does a battery monitor go when packs are parellel? Just on the output?
1 Like
Working is one thing. Working safely is an entirely different thing.
Better than a house fire.
What do you mean by a battery monitor? Like a capacity meter? If the batteries are connected in parallel, then you could put it on either battery, or the output of both, its all the same once they are connected.
5 Likes
I did mean a capacity meter yes. As Im looking at parts, I realize I have 2 torque 6 escs. Could I comnect one pack to one and the other pack to the other and then link the comm through can?
Wondering the safest option. If it is rebuilding the pack i may have to.
Also, thanks for the advice.
1 Like
If you were going to do that, then i would make sure that the CAN connection was only CANH and CANL, no 5v or GND.
As far as the safest option goes, if it were me, i’d rebuild the pack into one.
2 Likes
Would that be most practical solution? I have black and white wire so its already just canh and canl
And gotcha.
I cant see this method being a problem but ive never reallt heard or seen it.
2 Likes
What’s up peeps!
BMS-related question. I recently put an order to have some LLT 12S BMSs shipped and they arrived a little different from what I’m used to working with. Might be an issue with me shopping on ali at 2am 
These ones have a switch and it’s got me stumped. Has anyone here used these before? Can I just unplug the switch and use it as I would one without a switch?
5 Likes
You should be able to. Do you have a way to power the BMS on? In the LLT app you should be able to disable the switch functionality.
1 Like
Pretty sure you can just use it without the switch. However, it could be quite useful if you want to run some accessories using the discharge port.
For me, I am currently running my headlights off the switched output of it, however my bms doesn’t have a switch like yours so I have to use the app
2 Likes
Kaly would like a word with you
3 Likes
New batch LLT BMS are all like this. It’s annoying, but the switch can be controlled through the app
Besides it being more wires, I can’t see how this would be annoying
2 Likes
Wait doesn’t Hoyt do this?