Paging @Vanarian i think he had an electric rollerblade project happening at one stage
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Used FOCBOX singles would be a lot more kind to the budget. Did you consider using equipment that isn’t new?
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u might want to look into LLT bms, sure they are more than whats on banggood, but bms is a device that u don’t want to cheap out on
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If you know someone that offers two of these (and import tax isnt that high) I would also take used, shure!
So far on a quick search I have only found this listing with two available on ebay:
And that ebay listing would result in about the same price as the ones that got recommended to me before ~300€ for two 
Thank you for that compilation of quotes. Yeah then I will just add one of these on each skate and integrate the key into the housing (to be done) somehow.
Not sure if these are still available.
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Wow these are long! But for a reason as it seems to have more mosfets and stuff on it…
I will put them on my parts list thanks a lot!
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they do have smaller version that doesn’t have as much current capable and without ble module:
but i would prefer to have ble module to monitor cells if i can, that’s just me tho
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And the bluetooth is always on with these? I havent yet found information about standby power consumption or does it just consume power if I power it on? Like a switch somewhere? But they shure seem hq
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The idle drain of the bluetooth module is extremely low. It goes into a sleep mode when the app is closed on your phone
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some of them support a switch function, which would turn the bms on and off, also turning off the ble in off state, but ble module in general doesn’t consume that much energy anyway
Well… per-cell monitoring sounds interesting (totally overkill for a prototype xD) and i guess it helps to see if one of the cells starts failing and prevent risks of a full pack failure (if thats how its called)
But if my budget can be stretched a little bit more I will use the first ones you sent as they would be kinda cool…
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So its… bluetooth low energy (BLE) i guess so it should be fine
Do these work with bluetooth of laptops as well? or just phones because of the software (apk)
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I think you can order a module to connect to your pc as an extra, but i’ve only ever used the bluetooth and phone app.
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My Bluetooth BMS uses 3mA at work and 1.5mA at standby. It’s nothing. I can leave it on while storing my board. My esc (ubox) however, drains my battery very fast and I need to unplug it for storage. *Might be my flipsky antispark switch that’s draining the battery fast
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Single left
If my impatient ass uses grub screws instead of a motor key just to finally test drive this thing, will I die?