72v Battery with 80A BMS for cheap
Posted by PublicEnemyNo9@reddit | ebikes | View on Reddit | 18 comments
I've been searching for a while, since it's very difficult to find a battery that isn't priced insanely high, like places such as electro and co. I'm completely unwilling to spend over 500 dollars on an ebike battery, yet I need something that will provide 80a to my controller to reach max power. Is anyone able to help me with this?
I've found this, yet I can't verify it's legitimacy: Aliexpress battery
I've also found some amazon ones and such, but they all have low BMS rates of 30a and such, is that changeable?
Deep_Mood_7668@reddit
Reading your post makes me think you will burn down your house in the future
CrashTestPhoto@reddit
I wonder if there'd be a possible manslaughter charge for someone who gets told over and over that his cheap ass massive battery is a serious fire hazard and then buys it anyway, resulting in the deaths of his entire family and possibly his neighbours too?
I'd love to be a fly on the wall in that court room
According_Bat2315@reddit
You do realize the cells for you battery made in usa come from china
CrashTestPhoto@reddit
Pretty much all E-Bike Battery components are manufactured in China.
That's hardly news, bud.
What's the point you're trying to make?
MaxTrixLe@reddit
500$…… 72V 80A….. you’re going to need to adjust your expectations.
Any 72V 80A BMS battery you find under 500$ is either a scam, or a garbage battery that will die within a month
Slight_Temporary9453@reddit
or high discharge cells especialy if u get cells by itslef
TonyJian5@reddit
All the crybabies as usual. In todays time, thats basically non existent without aliexpress. Amazon and ebay used to have BTR 80a bms batteries but now theyre all gone. You might be lucky to get a 72v 25ah with 80a bms if you contact the seller directly. Otherwise, best of luck hearing all the whiny peeps who knocks what they dont know.
TemperatureLong1429@reddit
What are they no longer on Amazon/eBay?
TonyJian5@reddit
They still are, just not as many options as before. And the high BMS versions are all gone.
FlatDiscussion4649@reddit
For $500 each you could by two 72V 50A batteries and hook them in parallel to get a 72V 100A system. Educate yourself on what is important in that situation before choosing this path though. Mistakes will cause problems. I got a parallel connector from, electrifybike.com. You're still looking at $1000 plus the connector though...
Aidy3663@reddit
But you're absolutely willing to set fire to your house by cheaping out?
i_am_blacklite@reddit
With all your searching have you actually realised that a battery with the specs you require costs more than what you are willing to spend?
So either spend more to get the specs you need, or adjust your expectations for what you can get for the money you're willing to spend.
SnowDrifter_@reddit
I think this is about the closest you're going to get
https://www.bicyclemotorworks.com/product-page/72v-9ah-molicel-p45b-series-lithium-ion-ebike-battery
CrashTestPhoto@reddit
Yup!
Only 9ah for $500 is realistically priced for a pack that can discharge 80ah.
But, at full throttle, that's about 7 minutes of fun before your bike is dead 😂
This is in no way a criticism of your suggestion, but just a comment on how this perfectly shows the complexity and cost of running a 5000w bike.
CrashTestPhoto@reddit
Yup!
Only 9ah for $500 is realistically priced for a pack that can discharge 80ah.
But, at full throttle, that's about 7 minutes of fun before your bike is dead 😂
This is in no way a criticism of your suggestion, but just a comment on how this perfectly shows the complexity and cost of running a 5000w bike.
Visikde@reddit
Here's what I installed for my GEM with a 7kw 85vdc samsung pack. Programming runs off blue tooth with an app. Lots of options
https://www.aliexpress.us/item/3256802918259119.html?src=google&memo1=freelisting&src=google&albch=shopping&acnt=708-803-3821&slnk=&plac=&mtctp=&albbt=Google_7_shopping&albagn=888888&isSmbAutoCall=false&needSmbHouyi=false&albcp=9765122064&albag=101238896618&trgt=1480250979528&crea=en1005003104573871&netw=u&device=c&albpg=1480250979528&albpd=en1005003104573871&gclid=Cj0KCQjwhLKUBhDiARIsAMaTLnEZ5M58CsRgXIywHfofa0J-mKTCypg4ZQRFN-FJwTHeFR9ju3Sec2QaAocaEALw_wcB&gclsrc=aw.ds&aff_fcid=21188845bcf4427e813117801acbd99b-1653425079533-09448
CrashTestPhoto@reddit
If you're trying to draw 80 amps from a 72v battery pack, you *REALLY* don't want to be fucking around with cheap components.
Best case scenario: You kill your battery
Worst case scenario: Your battery kills you
You "can" pull 80a from a 72v battery, *BUT*, you need a battery pack capable of safely discharging that many amps. For a big enough pack that won't be depleted in minutes and won't spontaneously combust between your legs when riding your 5000w(?) bike, you'll be looking at $1000, at the very least.
The controller will set you back a few hundred for one that's actually rated for those amps, not just labeled as such on a reseller website for mostly cheap Chinese garbage.
You'll also need wiring and connectors that can handle those currents and not overheat.
None of these things are "cheap".
Please be careful and do proper research.
chrispark70@reddit
You will need a battery capable of putting out 80 amps. This will be a big expensive battery. I highly recommend you NOT buy one on aliexpress. It will have a fake rating, shitty cells, you'll be lucky to get 2 years out of whatever they send you.
You WILL NOT get it cheap. Your best bet, money wise, if you are mechanically inclined is to make the battery yourself. But I highly recommend against doing this if you don't have experience. Plus you will have to buy a battery welder along with all the other supplies and probably a heat gun as well for the blue shrink wrap stuff to keep it waterproof.