Custom battery for Evolve Bamboo GT

It seems like the advantage here is not so much the cost savings but the increased range and removing the power drop out on the stock battery. Are either of you willing to sell a custom bamboo gt pack?

 

Could you post closeup pictures of the evolve BMS (text on the chips is what I'm after), the UART communication is probably coming from the balancing/charging chip, which is probably some TI off-the-shelf part. If we knew which chip they are using, we could probably get a BMS with similar/same functionality, from some Chinese manufacturer.

I looked at the UART communication, and it would be quite trivial to fake the communication with an arduino, so you could use a custom BMS, without all the fancy battery monitoring stuff. It might be a little bit sketchy, as once battery voltage drops enough, it would just switch the board off, and not reduce to eco etc.

 

I only have this pic

 

H

Hi Nick
I have bamboo GT with AT only about a month old and am thinking about adding an aux battery bank on it using 10S 4p with 18650 3 ah LiIon cells. would connect all 10 cells banks in parelell with evolve cell banks.
the aux battery would fit beneath the evolve battery case

Do you see any problems with connecting the aux cells banks in parelell with evolve cells banks?
they would be similar chemistry and similar voltage so should work ok . keep evolve BMS and charge both from 42v charge socket
Cheers
notts

 

great post, what about for a Bamboo GT using 10S3P using Samsung 30Q; the specs seems pretty good. This will give 9AH and could extend the range from 14km... to 19/20km ?

1. Nominal discharge capacity: 3000mAh
Charge: 1.50A, 4.20V,CCCV 150mA cut-off,
Discharge: 0.2C, 2.5V discharge cut-off
2. Nominal voltage: 3.6V
3. Standard charge: CCCV, 1.50A, 4.20 ± 0.05 V, 150mA cut-off
4. Rapid charge: CCCV, 4A, 4.20 ± 0.05 V, 100mA cut-off
5. Charging time:
Standard charge : 180min / 150mA cut-off
Rapid charge: 70min (at 25 °C) / 100mA cut-off
6. Max. continuous discharge: 15A(at 25°C), 60% at 250 cycle
7. Discharge cut-off voltage: 2.5V​

 

That max discharge current isn't high enough you need at least 24A ish per cell if you are going 10s3p

 

thanks - I will go with VTC5A cells. They are 30A per cell. Can you share the final BMS cabling to the battery for the balancing cells ?

do you start the black at the + of the first pack or at the negative ?

 

Thanks mate. Did the 10S4P Sony VTC5A pack. Took me 8 hours. My friend was getting 14km in AT previously. He now has a bit more than 26km (17 miles) in AT - Fast/GT mode. Every Bamboo owner should do this to replace the cheap lipo pack provided in the Bamboo GT.



Still a bit slow compared to my little beast but well, that's an Evolve

 

Nice work Mate, looks good. FYI the stock pack is Li-ion not Li-po.

 

Have you made a 3d print riser instead of taking some of the deck?

 

I did, but I ended up milling out some of the deck to make it a bit more stealth and further from the ground.

 

How did you connect the cells? Do you have a diagram over it, im about to do the same mod to my board.

 

Check out my other thread for info How I built a 12ah Battery for my BGT

 

Great stuff! Where did you end up finding a wiring harness that connected to the BMS?

 

Any chance you could share this spacer file? Building my own 10s4p with Sony VTC6 cells for my Bustin.

 

I never ended up perfecting it, and to be honest it was a bit of a hacky solution. I ended up just milling out my deck (with a dremel) just a bit to fit everything in.

 

No problem, I ended up being bored last night and started to design and print one last night. The first half was finished this morning, fits pretty well! I like the idea of routing the deck, will have to see if I can have it done locally or if I am going to just do it myself.





View attachment 3071

 

That’s looking pretty nice, just a thought, you may want to join both half’s of the print at a bolt hole. That way you can have one on top of the other and the compression of the bolt would hold them nice and strong. Also maybe add some draft to the front and rear to match the stock case.

 

I was looking at that, but I'd rather not print in 3 pieces. I am working on a locking tab that will join the centers together. Which I'll probably glue as well once it's ready to go. Wanted to get it printed out and tested before I really did anything else. Working on version 3 and four already... haha.