Could be. But the original mount holes will give easier access to the target areas for spray. And the toptube cover will give a little better spraying access at the top of the battery. Plus, they're tubular, closed-cell foam to purchase. 3-4" diameter could be key. Or use both. Shoot the spray just to hold the closed-cell foam inserts into place?
I like it!🫡
Or maybe you are right...no foam spray...just the closed cell foam inserts.
Future project for sure!
for my budget now in order to buy a proper battery welder that I can trust and learn the skill. But huge weight savings.
The math isn't adding up with what they claim, with 30 cells total each 21700 would need 28wh. The very best cells on the market only offer 20.88wh right now with your way more common 5ah cells hitting 18.5wh. Originally they claimed it was a 10s6p or 60 cells, that's roughly 4.66ah per cell so way more likely, I assume the 3p claim was a mistake.Nice alternative! 2.2 kgs/4.85 lbs. 28Ax3px10s =840 Wh!
Vs. SZZS 720 Wh 4.0 kgs/8.18 lbs.
4.0 kg - 2.2 kg = 1.8 kg/3.97 lbs. Savings? 🫣
Holy sh$$t! I can shave off this much weight?
Is the casing really that much extra weight?
1 x 21700 cell = 60 g.
60 g x 30 cells (3p/10s) = 1800 g + 400 BMS/wrap = 2200 g.
It fits solidly in the frame with no fasteners? Wouldn't you still need a bracket at both ends to plug and isolate movement up and down the tube?
The next big question. How to save that much weight, there must be a light-weight retaining solution to firmly hold the battery in place?
Someone really smart and creative, what are some possible solutions?
Ah thanks, I knew my math was too good to be true!
2.8 kg 740 Wh - 4.0 kg Wh
For sure, although probably close to 2 lbs less once you get the bms and cells all welded together but good amount of weight savings you just need to make sure its well secured in the frame. I know a lot of people talked about not wanting the larger 720wh pack but delays made them choose it. The 10s3p with lg m58t's I think would interest a lot of people, roughly probably 2.5kg once all welded up and still 625wh for a good middle ground in capacity. 1.5kg in weight savings could maybe get some under the 40 lbs mark!Ah thanks, I knew my math was too good to be true!
I like it the updated calculations too! Samsung 10s4p softpack:
= 1.2 kg/2.65 lbs.
Wow! That's still a small chunk of weight!
Yes that cell, I couldn't find it available in the USA but the Vapcell F58 is a re-wrap of it. They have an official ali-express webpage for them though linked on their sites page. Not cheap at roughly $10/p but goes down with the more you buy at once like other cells. They must have just very recently started selling them though as I've been on the lookout for them for a while now and just noticed it a few days ago and the listing only has 6 sales. I got in contact with Mooch a very well known battery tester, and informed him of this as he wasn't aware the US market had access to them yet. He ordered a few and said he should have testing out on them in a month. https://www.vapcelltech.com/h-pd-174.html
So, 740Wh 10s4p = 40 21700-M58T cells x $10/ea. = $400. Not bad!
You can get a 50 pack for $350, a few extras for small projects. Hopefully they will hit the more mainstream stores soon, not a huge fan of buying cells from ali-expressSo, 740Wh 10s4p = 40 21700-M58T cells x $10/ea. = $400. Not bad!
https://www.aliexpress.us/item/3256805402455214.htmlWhy should I check the compatibility of the bms with the motor. I've been driving on this battery for 1.5 months nowYes, please test your BMS/motor compatibility.
. I have enough battery for 45-60km.
You just did!Why should I check the compatibility of the bms with the motor. I've been driving on this battery for 1.5 months now
This is a green bike battery for a handbagYou just did!
What's the Wh per battery again?
Apologies. I see the following are confirmed:
36V x 28 A = 1,008 WhTotal battery weight = 2.2 kgAnd the BMS works with the M820 motor.
What is the retailer name on AliExpress?
I did not correctly write 2.2kg x 2 = 4.4 kgApologies. I see the following are confirmed:
The link is AliExpress for the battery. I couldn't get the link to work.
. I showed an example. That you can install 28A.You are not alone with this problem. The plastic is very fragile, I touched a tree branch.Plastic motor cover got hit by loose rock when downhill
Add rubber protector will be stronger and safer. Just for attention to others.
View attachment 117702
Where to buy on AliExpress? The link won't open for me...just vender name. ThxI did not correctly write 2.2kg x 2 = 4.4 kg
Thank you @LAntonI did not correctly write 2.2kg x 2 = 4.4 kg
Where to buy on AliExpress? The link won't open for me...just vender name. Thx
a.aliexpress.com
You understand that the manufacturer makes safe batteries. Only we ourselves can make the battery lighter and safer.Thank you @LAnton
If I'm understanding correctly, you have 2 battery packs.
Each pack is 10s3p 36v 14Ah 504Wh 21700 cells 230x75x60mm 2.2kg
For those of us on a diet, this is fantastic! Bafang F014 410Wh battery pack is 470x63x52mm 2.55kg
Apart from the obvious Wh/kg ratio, I'm as much interested in the weight distribution of LAnton 's package
The length 230mm vs 470mm is half the length! This means with LAntons pack, ALL the weight can be mounted much closer to the bottom bracket. This should improve bike handling, jumping, berms etc...
link of BMS?
These packs not looks safe unfortunately. To prevent wibrarions under mtb ride.. one guy made similar with dengfu frame and catch fire
It's not funny :-( The battery should be made by a professional, not a guy on dengfu. A modern battery can catch fire if it is damaged. Modern cells have protection in the form of a valve. If the battery overheats, the valve is damaged. The battery is also protected by BMSThese packs not looks safe unfortunately. To prevent wibrarions under mtb ride.. one guy made similar with dengfu frame and catch fire
Yea it was made by customer. Better to let do it by professional than stayed dangerous
