60AH Bottle Battery Build - Anyone done this? Update: "No"

[Neiler106]

I had an idea for a 60AH bottle battery build.

It shouldn't affect the aero profile of the bike too much since everything is mounted behind a tube/fork acting as a wind break, but I also don't have a degree in aero dynamics so disclaimer inserted.

It would allow for swappable, and customizable range just by adding or subtracting batteries and you could store spares that were charged in-case one dies on you. And if you do it right it should sit behind front and rear panniers bags too concealing them a bit. Plus bottle batteries are cheap and plentiful and would be ideal for a commuter.

This would work great with a mid-drive too like the Bafang for GNG

Has anyone seen something like this? What do you guys think?

 

[DAND214]

Looks more like a TEST TUBE battery, size wise.

They are not small and they are not worth the money. 99% are junk, over rated/speced.

dan

 

[dnmun]

so you multiply 99% crap by itself 6 times, so that is (.99^6)=.9415 so it is less crappy for sure. 94% can't be all bad since it includes almost all the rest.

if you really need to carry 60Ah as though it is an electric car, then maybe buy three 20Ah packs and put two in back in panniers on each side and then hang one up front on a front rack above the wheel.

you are not gonna be making quick turns anyway.

 

[Gregory]

I wouldn't want to drill the 8xM5 holes in the fork and seat stays required to hold the batteries.

edit :actually larger than M5 assuming you want to put in rivnuts or similar.

 

[dogman dan]

60 ah will carry like crap however you do it, unless it's putting it on a cargo bike. That frame will be tweaking and twisting like wet spaghetti.

 

[999zip999]

Most bottle batteries are junk. To small for most peoples use. They use junk no name cells to start. So don't waste your money.

 

[Willow]

...for what reason??? You simply don't need a huge pack to go long distances. 20AH could be considered a long range pack... You wouldn't want to run it at more than 52V as the poor brakes and lack of suspension really don't make for a high powered or heavy hauling vehicle.

 

[100volts+]

I don't think those guys that traversed Australia had 60Ah packs

 

[Hillhater]

60 ah will carry like crap however you do it, unless it's putting it on a cargo bike. That frame will be tweaking and twisting like wet spaghetti.

Well......since this is a stupid topic,..i will show how simple it could be. !!
60 Ahr (but no voltage specified !)...so i pick 24 volts ! :lol:
Using 3.4 Ahr 18650's thats a 7s, 18p pack = 126 cells @ 45 gms each
= 5.7 kg pack ( 12.5 lbs ) ... that is not heavy !
I would put it in a back pack and keep the bike super light ! 8) :lol:

Note: .. i could have been even more stupid, and picked a 12 volt pack and ended up with a 6.25 lb , 60 Ahr pack

 

[Neiler106]

So... judging by everyone's flaming responses, that would be a no?

Right?

*shrinks into a corner to prepare for more comments related to "crap" and "stupidity"*

 

[Willow]

*shrinks into a corner to prepare for more comments related to "crap" and "stupidity"*

was not a stupid question in the first place... better to have explored the possibility than to have never.

 

[dogman dan]

No such thing as a stupid question. But I sure type stupid responses too often.

It was a legit idea, but experience tells me that carrying 30 ah of 48v makes a typical bike frame start bending like a noodle. They just aren't made for it, though some steel bikes can be surprisingly stiff. 60 ah of 48v is simply a lot of weight. Too much for most bikes.

This is why I built the monster of a cargo bike. It gets whippy when I load it too, but it will carry 48v 30 ah a lot more comfortably than any of my previous frames. Part of it is simply the advantage of long wheelbase. 48v 30 ah gets you a ton of range, like 40-70 miles. But in general I tell people not to carry more than 48v 15 ah for everyday rides. It's just too degrading to the handling of the bike to carry 20 ah.

Newer batteries are getting smaller though, so if 48v 20 ah fits in your frame triangle, then you can carry that ok. But not on a cheap walmart bike with a flexy aluminum frame. A very stiff beach cruiser though, it may carry it just fine.

The bike in the picture could fit at least 48v 15 ah in the triangle. Then another 20 ah could be carried with 10 ah each in panniers. But the thing would not be comfortable to ride loaded like that much faster than 15-20 mph. You can tolerate pretty poor handling at 15 mph. A bottle battery on the top tube would be tolerable only if you were 7' tall.

 

[dnmun]

i don't see how our observing the bottle batteries are crap can be interpreted as saying he asked a stupid question.

the point is that the bottle batteries are crappy batteries. that was what we referred to and for you guys to act like we said he asked a stupid question misses the point. just as he did.

i even pointed out how he could buy three of the 20Ah pouch packs for half the money and have batteries more than twice better than the bottle batteries.

 

[Neiler106]

thank you willow, dogman and dnmun for your constructive responses.

I didn't think about the weight factor but now that it's been brought up, weight is one of the things that we are trying to overcome with this technology and its application.

50-70 miles on 30ah is about right if you are traveling slowly.

I read somewhere that the rule of thumb is as follows,

at 36v, 1ah ~=~ 1 mile at 20mph (source: http://www.eco-wheelz.com/articles/how-to-choose-electric-bike.php)

I know ebike.ca has a calc on it but I'm too lazy

 

[Neiler106]

Thanks to everyone for the constructive responses.

I'd have to admit bottle batteries are pretty crappy but they are plentiful, cheap, and user friendly with their plug-n-play design.

It was mostly an idea, and turns out, not the best of them.