How to Connect External Batteries in Parallel and when to use Switch
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- Опубликовано: 3 дек 2024
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Since our last video on the solid state switches, we saw many comments on why don't you guys just parallel the 2 batteries? Mind Blown That we have already done and heres how and what to expect when you receive our ZERO external batteries which come with the parallel wire harness and (an optional) kids bar to hang your battery bag!
If you want to calculate how far you can go with two parallel batteries you can use our calculator here:
www.falconpev....
Back to the original motivation of this post: when do you want to integrate switching into your parallel set up? We provide the reasons why using the solid state switch makes sense for some. Watch till the end to find out!
Check out our ZERO external batteries here: www.falconpev.... 
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Glad i bought the external packs with both my 10X. Me and my girlfriend get crazy range now with 46Ah. And they installed it. Best thing is to ask at the time of purchase so both batteries are fresh.
How much range can u get ? And where can i get One ?
46Ah will easily give you over 110 km of real world range
@@raymondayeung I have 50 Ah (2x25)... and 120km is no problem (dual motors and no pedaling)
going a bit slower and pedal assist (single motor) I nearly could get 200
I never run the packs down to 40V ... at 44 under load and 46V no load I put the charger on .. means I may have 20 to 25 % left ...
Yeah, a spark is good. 👍
My spark was the best when copper welded itself to my stainless steel wire cutters. 😂
Other scenario: my bike has a built in batterie. so every time i want to charge it, i need to carry the entire bike to my flat. therefore i want a 2nd one, that i can use first and recharge easily. if i happen to need more than that power, i can switch to the internal battery on the run.
Hi ! I have a dual motor nanrobot 52v. The original battery has two discharge ports, and I just bought an additional battery with only one discharge port. Is there a difference? Can I still connect to controllers with one port? Or Will it overload the wiring or the battery? Thanks!
In conclusion, the cheapest parallel wiring harness is the best as it doubles the current output and decreases the stress on both batteries.
Hi I have a question,
If I connect 2 battery packs in parallel and on the 2 packs I chooses separate port bms ,they still going to charge themselves?
Hi there. So I just want to add some more capacity to my Apollo Pro which is 52v 23ah. I think I would be happy with another 10Ah of capacity. If I add the solid state switch to the arrangement then I would only need to plug my scooter to one port and charge both is that correct?
We do not have 10Ah. The 18Ah is going for a good promotion right now. You do not need the switch because they are both 52V. And yes you can charge them at the same time.
@@FalconpevSg Isn't it recommended to charge both batteries separately?
@@raymondayeung it’s better to charge them separately as there may be different charging rates for battery packs but it’s ok to charge them together too.
Hi, i have a question. Currently im using external battery as my reserve. Both internal and external batterries are using same V and Ah. Once i notice internal battery on low, I manually disconnect the internal battery cable and switch to the external battery via XT60. Is there any concern or safety precaution that i should be worry about on my current battery set up or do i need two of this Solid state switch on both batteries? Just bought Escooter a month ago, so still new to this. Thanks.
I've been using external and internal together both 36v
I also use both my pack in parallel so they share current
I have a zero 10x with an external battery that doubles my AH. Is it possible to keep the batteries connected in parallel and charging both batteries through one charge port?
I ask because sometimes I only have one hour to charge up a bit and I don’t want to deal with unplugging both batteries, charging the external battery for 30 mins and then the internal for 30 mins in order to keep the volts the same.
I added a y splitter also to charger and use a bigger charger to charge both at once
Hello which solid state swich would you recommend for a ninebot max both internal and external battery are 36 volt
we have one on our website here auto switch 50A: www.falconpev.com.sg/products/battery-solid-state-switch
If I order the 60v 21ah LG battery, it will come with XT90 connectors right? Same goes for the parallel wiring harness?
I plan on using this for a VSETT 10+ which has XT90 connectors
No problem just state the type of connector you need in your checkout order
I'm planning to do the same thing as you brother, which switch did you end up going for? Is: Auto Switch (80AH), 24-70v, dual battery configuration the correct option? And did they give you the right connectors for your 10+?
Awesome video just what I need
Thank you for your feedback
Hi FalconPev, 1 question.
I have spare Zero 10x 60v spare battery and planning to make it as range battery. My question is: why in your video there is only 1 port connector on external battery and the internal has 2? Can you please help. My scooter is Zero10x
our battery has 2 ports, maybe shown in video only one port, but its really 2 ports. but in actual fact, it depends on the size of the connectors. If the connector is a larger size that can handle the current, then one port is all that is needed.
@@FalconpevSg so it means i can connect it to any plug?
@@timcarranza1146 like in the video the plugs will be labelled. If you need any specific plug you can let us know and we will use those plugs on your battery.
i bought your parallel wire harness but i'm not sure if my external battery is actually being used. how can you tell when the external battery is connected and running parallel with the internal battery?? also my external battery has two XT60 connectors and when i connect the parallel wire harness to one of connectors it blows the fuse, but when i connect the wire harness to the other XT60 port it doesn't blow the fuse.. any help??
Pls email us
We need pictures
i use y cable on my bike
and use also an y cable on a charger... so i have both in parallel on use.. and on charge ... but one pack had an inline diode on charge port so i had to add also one in the other pack to match the voltages... now all fine
Hi. I bought an external batteries, the harness has one plug for the battery hut the battery has two plugs, does it matter which one Plug I use?
is that compatible with Varla Eagle One? can you give me the link where can I buy it? thanks
Hi i just want to ask if in this bag will fit the 60v 30ah 21700 battery thanks.
Must get the 72V bag version
The size of the battery is 16x30
@@erlitocanoza8616 yes it’ll fit
Does this also work with the Kaabo Mantis (IO HAWK Legend) this AKKU has 48V 18.2Ah in use with the same AKKU 48V 18.2Ah?
Yes. Just as long as your set up is the same.
Hello,
I have the Limited edition with LG battery.. This one hase 2 outputs.. So can i connect each controller on a output? Or do i leave it stock on 1 output?
Hey, I know this is an old video but I hope maybe I'll get an answer, I want to increase the range in my ninebot g30p, I want to build a external battery with the same or more Ah than the original battery(15.5ah), will I be able to just paralel them by the xt60 y splitter and use/charge them just by doing that? And if that will work, will the scooter read both battery levels combined averagely correct?
Yes you can parallel them both together with a xt60
@@FalconpevSg hi, I have almost the same scooter, 36v 15.3ah stock battery, if I buy 36v 20ah external battery and do parallel connection, would it cause a problem or do I need a switch or firmware for that? Will the scooter read both battery levels combined averagely correct? Thanks a lot for the answer
@@ataman3141 also wondering this
@@ataman3141when connecting both needs to be same voltage!!! so same state of charge!!!
So if I have external battery with different capacity, same voltage and different discharge rate would it be better to use Switch?
Tbh there’s no need to if the voltage is the same. Save yourself that money and just try to do voltage matching
different discharge so different voltage is unsafe with y cable!!! if both packs are full or both at 50 or 60 percent then connecting y cable is safe
If I use 2 batteries in parallel, both 48v 15ah ? Will it then be 48v 30ah ?
yes exactly
I bought your cable but when I open my scooter I don’t know which connector is I1 or I2. Is anything wrong if I connect them randomly?
It doesn’t matter either way works
@@FalconpevSg thanks! And in the case of the charge port can I connect randomly in either one of the two charge connectors in my external bat?
@@luismario2540 yes any one would do too
if i add another battery, should i change the original charger?
What size are your adaptor?
Very edifying!
Thank you!
how can I purchase this set up
Do these only work with Zero scooters?
No it’s universal, could across many different models
I have a question I have two exactly the same batteries 52v 26ah but both fully charged show different voltage on my voltage keylock ignition screen when I plug them in separately. One says 57.9v other says 56.3v will this be safe to use this lead and be safe to connect? They work perfectly on my nanrobot D6+ just the cells on both have a cell or two each needs replacing. Can you help please
Do you know the answer?
@@itiswhatitis528 nope
@@DripdropBrewing Damn it. Did you connect it pararel to your scooter? If so, is it working correctly?
@@itiswhatitis528 nope I asked so many people and giving me mixed answers so I gave in and don't want to risk damaging my batteries or causing a fire. I'm going to leave it and keep it original 👊👊👊 if you do get answers and get this working please could you let me know would be nice 👍👍👍
@@DripdropBrewing I have exacly the same situation with my 60v battery for Wolf Warrior X. One is 67.2 and the second one is 66.3. Both works perfectly separately but I am not sure if it is safe to connect those pararel ....
how does parallel battery pack paring effects the battery with lower ah??
lets say i have internal pack which is 25ah and then i buy this external pack which is 12ah,
or by pairing parallel the controllers will drain both packs equally regardless of each packs ah capacity???
thanks.
Assuming same voltage, it will drain both packs unequally drawing more current from the pack with the higher Ah which is also the pack with the lesser internal resistance.
If i run a parallel conector, do i have to have both batteries connected. Could i only run the internal, and take the external battery off the circut?
Yes you can. You can run them together, or separately, by connecting/disconnecting the wires to/from the parallel connector. If you connect them both and try to charge the batteries it may not work because the BMS in each battery pack will conflict with each other.. You will have to charge the battery separately. Or remove the BMS from one of the two battery packs for the charging to work.
How much ahm u use for fuse?
Were can I buy one of these solid state controller for a 60v scooter.........many thanks Jondon UK
you can find it here: www.falconpev.com.sg/products/battery-solid-state-switch?_pos=1&_sid=3fb43c50b&_ss=r
its not conflict having 48 V dual hub motors to install external battery in same voltage?
thanks for the answer more power
No problem with that
@@FalconpevSg 5 star
I also have dual hub ( and now also dual pack )
hey i want to add two 60v batteries in series and use a switch to shift the batteries if one of them drains out so we switch to othe one. can you help me with that?
So you mean in parallel not series, otherwise you can’t really switch between them. If so Yes you can, check out our solid state switches
How do you charge the two battteries?
Each battery has their own charging port so you can plug in 2 chargers one to each battery
@@FalconpevSg thank you.
I only have 1charger.
@@FalconpevSg and one more thing may stock battery is 1year older to my external battery, but it's still perfectly working .
Do you think it's fine?
@@FalconpevSg Is it okay to leave the batteries connected in parallel using Falcon PEV's basic Y parallel cable and charge from only 1 port at a time? Would letting the battery getting charged to charge the external battery as well through equalisation?
most packs can NOT be charged on the load port
Hello, should I be concerned if there wasn’t a spark? Does that mean the external battery isn’t alive ? I charged both internal and external before connecting them but there wasn’t a spark.
oh the spark isn't mandatory. it doesnt mean that no spark means no charge.
What size are the wires in gauge?
Yesssss thanks Fam
Thanks bro
Can I use solid state switch to utilize batteries with different voltages? My scenario is to use lower voltage external battery which trades speed for range.
72V internal battery plus 60V long range battery and switch for 60V battery when 72V is depleted.
Batteries have to be same voltage. The solid state allows for different capacities to be connected. So like if you have a 52V18Ah and you want to connect to with a 52V23Ah... That would work. But 60 and 72 won't be possible.
@@zaire.mg. hats not what the poster said… thats only if theyre directly kn parallel without a smart switch
no .. smart switch needs to have both packs same voltage (roughly)
in your example with 72 and 60v.. smart switch sees the "empty" 72v pack and sees a full 60v?? then it thinks the 60v full is also an empty 72V
ok one more question one of my battery is 48v 30ah with 5a charger another is 48v 15ah with 2a charger , how do i charge them ? will 5a charger damage 15ah battery if parallel connected ? i dont know do i need to have switch for this 2 batteries in paralel ? i cannot find any video online properly explaining how to do it , or when i charge do i need to charge both batteries separately with its own charger help friend ?
Please I hope you charged them separately. Because you are charging both batteries at a different rate of charge. That will cause problems if you charged them parallel connected.
@@techgeek2994 use a y splitter cable and only the 5 A charger.. or buy a bigger charger (maybe 7 or 8 Amp)... the y splitter cable behind charger keeps both voltages identical
I have an inline diode in both charge ports.. means charger sees both packs but one pack does not see the other pack
I have an ebike with a hialong 52v17ah and a 52v20ah rack battery. I have them connected in parallel with no switch - I just use one at a time. I'm trying to use them both to get more range and power. Would this switch allow me to use them simultaneously? Or will it just switch between the two during a ride?
You can use our parallel wire harness
If you are using one battery at a time then they're not in parallel to start with.
@@DanceySteveYNWA technically right. But this topic is about when to use parallel and when to use switch
use them in parallel..... not one after the other...
I have a vsett 9 super 52v 17.5ah, can I use this external battery?
Yes of cos
thank you
Hi. If I buy this battery. I just install it the way it explains the video will it work? Another question is, to charge the two batteries will it be the way I already charge my original battery? "After the battery is charged, it starts charging the external battery" thanks.
You can charge both batteries together. What scooter do you have
@@FalconpevSg Zero 10x 60v. When the internal battery reaches 100% does it start charging the external battery? Does this not reduce the number of recharges of the internal battery?
@@marcoridolfi7056 no it charges both batteries together
@@FalconpevSg So does the external battery recharge through its discharge cable? I only saw the discharge cable get connected to the parallel harness in the video.
@@brettswiecicki5075 it recharges through its own charging port inside the bag
Can i connect two 60v batteries but two different brand?
You need to make sure the current discharge is more or less the same
Will this work with dualtron ultra 2?
Yes it does
Is it possible to order a bigger battery from you guys and use as an external? Maybe like the same one the Zero 11x comes with?
As long as we have a bag that fits
@@FalconpevSg Do you know why my battery cuts out at about 39.5 volts? (it used to run the motor right down to below 36 volts). I would be grateful for your advice.
@@nicholasmorrill4711 battery cells are getting old and cannot hold the same charge anymore
@@FalconpevSg I know that because it only charges up to about 40.5 now but should'nt that mean that it should still run out to the same level as before? (about 35.5).
@@nicholasmorrill4711 no the fact that it doesn’t charges up to full capacity means that the discharge rate is susceptible too. Voltage is a good indicator but it doesnt tell the actual charge capacity of the cell.
So, if I have 2 battery's both 36v but different Ah, I can just connect them using a Y cable?
Yes 👍
i want to buy this
can i use paralel connection for 2 batteries with only 1 controller or i need 2 controllers ?
Doesn’t matter the number of controllers. You can use 2 batteries or 3 batteries for one controller
@@FalconpevSg ok perfect and do i need to charge batteries separately when they are paralel ? i ordered the cables allready as soon as i saw your video
@@techgeek2994 you can charge them together
@@FalconpevSg on which port original or it doesnt matter ? thanks for your help
@@techgeek2994 if they are in parallel it doesn’t matter
Why not sell a unit that has a high capacity already? like 60v 45ah 21700 5000mah cell 16s9p right?
Not enough space in the main compartment and also cost wise more expensive upfront
If I have a60 volt battery and I add a 48 volt battery is it okay?
Only if your controller can take it
If I have 60volt controller’s? It is okay or should I add another 2 48volt controller’s?
Thank you for your help 🙌🏻
@@maxshara yes sure. But why do you want to do that?
@@FalconpevSg because I I’m adding a48 volt battery to my 60 volt scooter
Does anybody know why my battery cuts out at about 39.5 volts? (it used to run the motor right down to below 36 volts).
Well first we need to know what type of scooter you own. And you never ever let any scooter cut out or fully charge it ever that's why your having problems and your killing your cells and won't last long
controller is maybe a 36v 48v combi controller and now it thinks it's in a 48v system (cutting out at 40 Plusminus 0.5)
@@DripdropBrewing I have only just discovered this post never having seen a notification.
I don't own a scooter I own an electric bike & I replaced the whole electronic system since making this post.It is now running super dooper & I do charge it fully but because I replaced the built in battery with a larger capacity one have never run it right out.
@@dg9bfc Since I replaced the whole system there is a new controller in there.
If I can ever get round to it I might stick the old battery back in there & see if it runs ok now or I might wire in the two battery's for longer rides,well shall see 🙂
(Someone else mentioned a fault with the controller rather than the BMS or whatever you call it in the battery & I had never thought of that before.First the horn stopped working then the front light & finally the brake cuts outs before I replaced the whole system so maybe I should have thought of that).
One thing you don’t show is in that bag is a another power port if pick the wrong one does not work.
Connecting in parallel is a dangerous method,it can burn both of your batteries or degrade them prematurely,one discharging the other.The safest method is to extend the cable from the controller,tonaply a 6 pin swich(ON-OFF-ON) and to use separately the batteries,also charging separately.If y realky want to connect in parallel without switch,y need 2 new batteries with the same voltage,the same brand and the same capacity,fully charged and use the same distance of cable for connecting to controller and charger.Otherwise,y will have errors of charging batteries.
Has anyone actually installed the solid state switch relay on their scooter? I'm curious, because clearly its way too big to install internally, and with that logic that means the switch relay will need to be installed somewhere externally and there will be more wires that will need to be outside of the deck.
“A spark is good”
Uhhhh an anti spark XT90S is like $2. Not using one screams cheap component selection.
Why destroy your connectors with constant electrical arcing? It will raise the resistance of your connector
Anti spark connectors are usually lower in current rating than the non sparking ones. But regardless alot if escooters use normal connectors. When we say a spark a good it means the battery is still alive.
You don’t say which plugs to plug into which XT60 plug for the internal battery or which controller is number one and number 2. If it doesn’t matter you should say it doesn’t matter which ones to plug together otherwise we will be afraid we will get them wrong. You need to be more detailed and precise as many of us know nothing about what to do.
They are all labelled so you don’t have to worry about plugging in the wrong one:)
@@FalconpevSg I know your plugs are labeled but my plugs on my battery and my controllers are not labeled so does it not matter which ones I plug into.
What I’m trying to say is, sure, your plugs are numbered but mine aren’t so how am I supposed to match them up?
@@basincut100 once you open up your scooter, you'll see the wires FROM your controllers and your battery coming out..... thats how you'll know which cable connects to the labelled connectors that is provided to you. :/
Example, their cable is labeled INTERNAL CONTROLLER 1 AND INTERNAL CONTROLLER 2....so what you should do is look for your 2x controllers (hence the word INTERNAL). Thats your 2 x silver boxes. Look at the cables coming out of it. Connect it from there...
Spark is bad, it's very bad, it will damage the connector and you will have to change it at some point. Just use spark protected XT 60-90S connectors.
Yea but the voltage rating is much lower. They cannot reach 60A
why are sparks bad?
You cannot discharge and charge with DC current at the same time. Your explanation makes no sense.
The correct answer is if your batteries are at different voltages the current when connected in parallel may be quite high for a short period of time. The battery discharging can likely handle this but the battery taking in that current…well nearly every lithium ion has a charge rate that is a fraction of their discharge rate. The P42A can discharge at 45A (below 80 Celsius) and is likely capable of bursting higher than that without negative consequences (the data sheets often give two life cycle numbers for a slow charge/discharge and a fast charge/discharge so keep that in mind) but the max fast charge rate of the 42A is 8.4A or 2C. You’ll see that even the best power cells from Samsung/Sony/LG typically have a limit of 2C when charging but discharging rates can be 10C.
So one battery might be discharging at a rate that is close to or within manufacturers spec but that means the lower voltage battery will be FIVE time over the safe charging rate.
Voltage differences of less than a volt typically only give very short bursts of current before declining to a much smaller rate but over one volt and you can see some very large balancing currents that last for more than 10 seconds depending on the size of the batteries. So besides voltage difference there are two other factors. Internal resistance and battery size can increase the current rate and length of time if the pack has low resistance and is very large in capacity.
This can be simulated by taking two high IR cells 1V apart and measuring the current flow vs two low IR power cells 1V apart and measuring the current flow. The low IR cells have the ability to balance each other faster albeit at higher currents. The larger the pack the longer it will take them to balance which means more time it will take for the voltage delta to change from 1V to 0.9V
Thank you for the detailed explanation.
We understand what you are trying to explain in detail but when explaining to lay person there is no way that explanation wouldn’t fly over the head of most people. What we are trying to say is essentially the same, but communication needs to be simplified so people can understand.
Yes, your message is too long and I was feel like going to sleep. God did tell me that what you said (all of it) is incorrect.. As for the Molicel P42A battery cell handling 45A discharge and 8A charging is incorrect it will cook those eggs for good. Their test rating is fraud. At that rate those cells will go bad very quickly, less than a month. The Samsung 40T cells on the other hand are the opposite, they handle 45 to 50A discharge and last much longer than that. It can handle 8+A charging as well. For the Molicel P42A the safe charging is at 1.5A, that is one and half amp. The owner that runs this company will run into serious trouble cause a lot of high ranking criminals are getting scammed by these batteries. You also need to be careful on the Samsung 40T cells as almost all of them floating in the public market are fake, but performs better than the P42A in charging.
Hey so what will happen if I install the external battery first on the scooter before charging? I won't use or ride the scooter yet. Then after installing it, charge both the internal and external batteries. Is this bad or it doesn't really matter since I won't ride the scooter until they are both fully charged anyway?
You'll be fine if you do it that way. Just make certain you plug everything in correctly and when you do charge them you, they are fully charged and you'll be good to go.