LiPO E-Bike Battery Selection. Amps? Watts? Power? Fire? EXPLAINED!
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- เผยแพร่เมื่อ 12 มิ.ย. 2024
- This is the second video in a series of videos all about how I selected and built my custom electric downhill mountain bike.
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Drop a comment below if you want to see additional videos on anything E-Bike related.
Videos of riding the bike are coming soon!
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Well done! Looking forward to the CYC x1 install video!
what a great, clear cut and dry video. one thing to mention about your calculated watt hours: it should be "nominal". the 75 volt figure you got is from when they are fully charged. nominal value for those batteries are 22.2 volt so using them in 3S is 66.6 volt. 66.6 * 20ah = 1332 watt hours
Great explanation it was what i was looking for 240 amps thats insane
your video helpmed me a lot, thank you!
Very nice explanation!
really helpfull for newbie like me man thanks man
My X1 Pro Gen2 shipped last Friday.... Eagerly awaiting. Have a custom 72V battery being built...
Very nice educational vidro
i use these batteries and many more other and i can say if you want to get your bat alive long time, put it 1c to 2c of load and for 5sec the C number on your lipo..
Very good
Thank you
Cheers bro. Ive been looking battery ideas for my build. Ive got gen 4 Cyc with x12 controller currently only my hard tail specialised but i am going to put it on my kona stinky downhill bike. Currently with the battery ive got just now i am outputting 3500 watts but i would like to add a second battery. I am not going to use a balancer as i dont plan to run both batteries at same time, when one died plug in the other, just be good to get some extra range.
thank you!!
Well done, very informative video. I am currently building a hardtail ebike with the CYC X1 Gen 2. I am hoping you detail your battery build as this would be very useful for me should I go this route. If not I will purchase a complete battery that’s ready to go. I was very impressed with how easily the motor was to install. Are you using the stock controller?
I haven't had time to install the motor yet but good to know that it is easy to do. I am using the stock 72v controller
Ryan V
Hey mister I will do the same setup
Nice video. Is it safe to make them into a single pack with a 18s bms?
Hi man great video! I am thinking about converting my commuting bike into an E-bike. I have plenty of experience with RC-cars, planes, boats, etc... So naturally, I began looking at hobby rc batteries. I am looking mostly at 48V kits, that is 48v speed controller and 48v motor. How can i arrange the batteries to match that 48V? 12 cells would give me 44 volts nominal and 50,4 volts max. Is this going to work with a cheap 48v kit? I'm thinking maybe the speed controller will shut of when it goes down to 46V and that I therefore only can use about 30% of my capacity? I don't have the facts yet but do you have any clues here?
Thanks
One thing I haven't seen but would be cool is frame modification to create a battery compartment that's structural
Just a note, but it would have been safer to use the min voltage you expect to run down to for the amperage calculation. To get 4kW when your battery isn't at full charge will require >53 amps.
This was great, one of the cleaner lipo eBike tutorials out there . One question how do you tell which voltage to discharge to safely?
Generally a fully discharged lipo cell (one single cell) is 3.1 volts. So multiply the number of cells in series by 3.1 and you will have the total pack voltage at fully discharged. This number will vary a little. Some say 3.3 some say 3.0 but I have always used 3.1v as my low voltage cut off and never had issues
@@RuffRoadDesignsty, also forgot to ask do you charge them still connected up in series or do you need to disconnect them? And what are your favorite sources for packs hobbyking? Ty very much 👍
@@RichardNBBarrett you will break them back down to individual packs, other wise you couldnt use the balance port, which it needed to balance, but not everyone balances every charge, but i always did
Btw you can put batteries that have the same discharge rating ( C rating for all batteries are the same) but different cell count in series. Like you can make a 18s battery from 4S + 4S + 6S + 4S that have the same discharge rating otherwise current will from from the higher discharge cell to lower one.
You are correct, in the video I ment that each individual cell must be the same capacity, discharge and voltage. Ideally each cell would have the same resistance as well
Ok hopefully someone can help me with this. So im trying to build an electric bike too and i ordered a 24v 350w electric motor and a 22.2v lipo battery. The battery's connection is a xt60 plug and the motor has these a black and red wire with this golden thing on it to connect to a battery. Since the connections for both are different, I bought a xt60 to wire adapter so that i can plug the battery to the adapter, and the adapter to the motor. So to test it, i touched the adapters wires and the motors wire ends together and then there was a spark and a small fire. Can anyone tell me how to fix this
You mean your rolling fire 🔥 bike 🚴
With proper care there isn't an issue.
i have bought my "fast" chargers for my lipo batteries before i even bought the electrics for my bike including the batteries. i am going to use four 6s 20ah packs in series, and of course i will have two sets so i can charge a set while i am out riding, come back and swap batteries when i get low
How did that work out for you?
@@pnewt8458 worked out great. i ended up with six isdt q8 max chargers. last week i decided to a capacity test on each pack and found that on average i lost about 9.5% capacity over the course of two years. i did destroy two batteries and had to replace them, but this was from being dropped by a friend while not even riding.
Most electric motors can handle extremely heavy overloads as long as they are not overloaded long enough to cause them to overheat. In fact, some motors can provide more than three times their rated power for limited intervals.. its all about the speed controller. I have 2 tronic 250 amp controllers with a decent BMS setup running 2 rated 750 watt motors at 2000 watt a piece.. runs absolutely fine.. as long as there is good ventilation motors should hold up
What's your bike weight, your weight and top speed and range? 😊
What current do you usually charge at? I have these same batteries and always charge super slow (overnight) using 2amps… but in theory can’t they charge at 40amps - (20 amps to be in the safety factor). So curious what you usually charge at…10a? 15a? Less?
I usually go with 1C charge rate to be safe, so 20amps.
Thanks I know nothing about batteries and I need one for my bike a good one with as much as I can put in my bike I was going to buy one from Lightspeed a 21700 72v but $1400 🤔
That's not a bad price depending on cell type and Ah
Price?
Do you need something as big as 20ah would a 6s 10ah be enough
20ah big? 😅
@@andyfumo8931 tbh I bought a 42ah 72v bike but it was to dam heavy
any reason you went with a lipo? lifetime is going to be quite a bit shorter than standard cells
The watt per oz of lipo batteries is hard to beat. I expect 400 cycles out of these batteries still with proper care. Plenty given the cheap price
@@RuffRoadDesigns I use LIPO's for drones and have never gotten close to that many cycles, have you gotten 400 before?
@@loreak128 I have been up to about 200 but always sold my rc stuff or upgraded before it stopped working. Definitely saw some capacity loss but the rc cars always pulled really high current so hopefully only using about 5C of the rated discharge will help the ebike
@@RuffRoadDesigns Yeah pulling 80-100c might have something to do with it lol
You are an engineer, right? When you mentioned safety factor I guessed that you are, that’s what they teach at engineering schools.
Yep! I am a mechatronics engineer in the medical device industry.
The 12c is the continuous discharge and 24c is max peak (momentary) discharge. The ESC shouldn't pull more current than it's rated for.
Great comment, Im worried about my setup on the way. I have (7) 11.1v 60c batteries in series at 77.7 volts for TWO 72 volt 3000 watt motors for a go kart. Im running two motor controllers for the motors each rated at 60A. I was worried if I put 7 lipos batteries together they will spit out 60c x 7 = 420 amps! Im hoping the controllers will only take what they need.
@@tooshmart6669i think you should be fine, you wouldn't times by 7 since its run in series so whatever the amps are for one of the packs is the amps for the entire battery
For this kind of battery do I need a BMS?
not necessary but highly recommended to use BMS for anything that uses lipo as they are more dangerous than normal ion batteries
ALWAYS use a BMS, just like ALWAYS wear a helmet 😅
What BMS are you using?
No BMS just balance charging
@@RuffRoadDesignsrisky sir, but you are well versed, good to explain to others though the necessity of BMS for the average rider who only knows how to sit and twist
Actually no it wouldn't melt that box,lipo would burn out before it even heat that box up.
Don't underestimate rolling resistance of your tires. This is just one of the many reasons I think fat tire bikes are stupid.