The battery builders club

How-Tos & Esk8 mechanics
, , , ,
20015

Grey is just indicative of that pack having the lowest voltage. Red is the highest.

5 Likes
20016

Iā€™m currently making an inert lug with wires on each end and alligator clips so I can use my bay charger to individually charge up group 11

All this balance work has really made me consider a balance connector panel with an external BMS/balance setup.

20017

Iā€™ve used an LLT to balance a 1.8V difference once, took 1 week :laughing:

1 Like
20018

Took 1 week for what? What happened to the 1.8V drift?

20019

to fix the drifted group. it went away, I had a malfunctioning flexi installed before.

3 Likes
20020

Thats actually quicker than iā€™d expect from an LLT :rofl: was it a small pack?

1 Like
20021

12s6p VTC5A :smiley: I had it on always balancing, and took the board on rides in between, maybe that helped. :smiley:

2 Likes
20022

Wow. Thats a fair effort.

1 Like
20023

I have mine set to always balancing, and I do intend to ride this frequently once Iā€™m sure I can seal it all up again

20024

It wouldā€™ve been faster if the LLT supported active balancing, but afaik that pretty hard to do compared to passive.

1 Like
20025

Weird, I have LLT as well, and itā€™s sat on balancing for over a week and couldnā€™t bring back 0.05v

20026

Yeah most bms just bleed off the high cells from what iā€™ve seen. You can get some cool active balancers tho. @Scepterr has one that balances at 2a :exploding_head:

2 Likes
20027

huh, did you limit the balancing current by any chance? whats the p-count?

20028

Idk maybe I have a setting wrong? 12s7p of 30q and itā€™s got one low cell, 4.07v and the rest are around 4.12

20029

I have some balancing boards in my smaller boards that donā€™t fit a BMS. Those do active balancing at over 1A, and only cost 12ā‚¬. Pretty nice :smiley:

1 Like
20030

Nice!

2 Likes
20031

Are you sure that your threshold is set under 0.05V? Also that a very small amount, not problem at all I think.

1 Like
20032

It grows a bit at end of discharge cycle to 0.1v, my range isnā€™t amazing nowadays

I think my threshold is set to 0.03, I will check when Iā€™m home

20033

Sounds more like that group is starting to give in, probably a weak cell in there. :smiley: That cell also has higher resistance, making charging more difficult, hence the pesky 0.05V that wonā€™t go away. Just my two cents though, more spitballing than everything.

2 Likes
20034

I would agree with this. Have seen similar behaviour.

3 Likes