Did you ever accomplish this??? I have been trying to do this!Hi Wayne, great idea and helpful information.
What irritates me a bit is your starting post with the possible 'caveats based on the manufacturers use of proprietory Can Bus signals'. What does this mean exactly. Can I build my DIY battery within the motor spec and it will work or do I need a special tool like BESST or a special BMS to make the battery work with the rest of the CANBUS system.
Reason I am asking is that I try to build multiple 100Wh basic packs to parallel them together being able to take the 100Wh blocks on an airline. For sure not the state-of-the-art Amp monster when talking 48V but at least a chance to get an EMTB abroad.
If there is more knowledge required than a DIY battery I would appreciate a helpful link where I can find the required info. For the moment still waiting for the frame and initial Bafang set to arrive here.
Thanks in advance.
I've made many packs over the years. I wouldn't be happy with this one, corners have been cut - and the soldering iron tip wasn't big enough or hot enough.To whom it may concern: yesterday finally got my custom 14s4p 52v 20ah battery for E10. It took me a lot of time to get this battery due to having to wait for 14s BMS which turned out to be faulty and then needing to wait another month for a replacement one. But finally it came and I have the battery installed.
The battery was a very tight fit and it wasn't easy to get it in. On the bright side there is very little play left in the frame and it's secured my velcro straps and some dense foam padding.
Got a chance to test the battery today and was pleased with the performance. I believe there's some noticeable power increase, but difficult to judge due to weather conditions changed drastically. Half of the ride was on the snow covered trails with snow about 15cm deep. But the bike was doing well and I was able to ride through using 60-80% of max current. Used about 7v on my 31km ride which is not bad considering the conditions
I am attaching some photos below to show the insights and the fit
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Great thread, thanks! May I ask a few questions?
So the Dengfu 840Wh battery is made with 18500 cells, and the 780Wh battery is made with 21700 cells?
Is the 780Wh the better choice overall then?
Is there anyone building battery packs with the 21700 5800mah cells? I wonder why they aren't used by almost anyone. A rather light 14s3p would be over 900Wh.
How much weight does a softpack save, over the regular battery case, 1kg?
So to get this clear, you use put industrial velcro on the backplate (of the battery pack), and then velcro the softpack the backplate? The backplate is held onto the frame by the locking mechanism, right? No rattling, etc.? Any foam to keep it firmly in the downtube?
By doing this, one could have a spare softpack in the backpack, and swap it in a minute in the field?
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