Higher potential to go over voltage braking downhill on a full battery, but haven’t found it to be an issue so far.
@bsancken that’s correct. Backpack Battery has its own BMS. Output feeds into the input of the MPPT. That connects to the board through its charge port.
… Officer, please stand down those bomb disposal guys I’m just tweaking my charger 
The more I see of these the more I think I need one, even before I got my first eboard I was emailing asking if there was a backpack or something I could use with it 
I really like the idea and would like to build myself something like this. I just can’t stop thinking about what might happen if I were to go down at speed with a lithium pack in my backpack. Best case I land over a brick with my spine. Worst case, I land over a brick with my spine and then ignite. I guess proper padding would mitigate these issues. But it probably wouldn’t hurt to brainstorm some safety measures in addition to the technical side of things
I’ve had one of the secretaries at a building on my college campus want to call the police when she saw my board outside the room while I was in class, thought it was a bomb lol Though in all fairness, it was before I had a case for my lipos…
Haha awesome topic. I am for more then 6months working on this.
I hope to start selling a plug and play box in this and 3months.
I am very perfectionist in these things. That’s why it takes so long. Currently it is planned to offer two variants. a cheap one with a capacity of + -250wh. This will have locked charging voltage and current. And a more expensive one with a capacity off 450wh with adjustable current (0->5A) and voltage (0->70v). With the biggest one you can use it also like a small bench table power supply 
You can check out some more pictures on my Instagram story: https://www.instagram.com/s/aGlnaGxpZ2h0OjE3OTU5OTUxMDg3MDk0NTIz/?igshid=5s5wynlikg7&story_media_id=1865547804756636738
Fuck…
I’m out…
Technically you are down, not out.
Thanks Dad! 
Cool! Are you planning selling these with cells or maybe to sell just the electronics and the box? Just instantly worried about shipping lol
Normally only with cells, So only possibilty to ship in the EU. But maybe later without cells, only part is the biggest enclosure will be running a 20s pack, so that is a high voltage on DC that can really be your dead 
Here’s my version… fits straight into the charge port on my hummie.
Link to topic on “the other place” https://www.electric-skateboard.builders/t/range-extender-plugged-into-charge-port/64327
What boost converter did you use? Do any of the components get hot (battery, wires, converter, etc) during charging while riding?
I used this-
1PC Boost Module 1500W 30A DC-DC… https://www.amazon.co.uk/dp/B07DNH9SDS?ref=ppx_pop_mob_ap_share
It has an automatic fan that kicks in for 10 seconds or so every 5 minutes at 4A charge rate. It will get warmer at higher amperages.
All the other components stay cool.
I don’t know if you’ve already done it but can it be used as booster charger in a car trunk? So you already have charged spares or just recharge while you move to your next ride location?
Or you do moving pit stop for the team 
It can be… No need though, I’ve got a 5Kw pure sine inverter and 300Ah of batteries in my van so I can charge whatever I like!
Everyone this last week looked at me like I was going to spontaneously combust when I busted out my charge-n-ride pack.
Still have not caught fire thank you very much. You people have no faith.
You act like that’s strange around here
