Alesha Ellen Richardson Posted November 27, 2015 Share Posted November 27, 2015 Hello all So the time has come to attempt some mods for my 16in gerneric its called a Zip Wheel, Its not a bad low end model i get about 6 miles out of the battery and the speeds ok. The other day i was enjoying a ride around my area and decided to push the limits and before long i noticed i only had one bar left and a hell of a walk :(. I found that there is loads of space in this thing as its a 16in i want to add a second 60v samsung battery with a switch to change banks, easy enouth right? Then it dawned on me why dont i have a mobile/whatever 12v/5v output for those i forgot to charge my dam phone moments and possabley lights aswell, all from the second battery :). Im not to bad with a soldering iron or wiring i was just wondering if theres any reason why i cant do this? Also anyone know of anyone else thats done this before? oh and last thing a tracker will also be ran from the second battery as my last EU got robbed from me at knife point, they're not getting away with it TWICE! Alesha. Link to comment Share on other sites More sharing options...
Keith Posted November 28, 2015 Share Posted November 28, 2015 Assuming you are going to use a similar battery to the presently installed one, why would you not simply fit them in parallel rather than switch over. A switch is also a point of failure that could end up face planting you if it fails. You would half the internal resistance, raising the voltage at the wheel, therefore lowering the current for a given power demand. I.e. You would go further on a parallel pair than you would on two single batteries. The charge connection could be parallel as well, it would just take twice as long to charge. Are you aiming to buy a whole pack or build it from individual 18650 cells? What I haven't got my head around, and maybe someone can help, is how the packs keep the cells balanced, I.e. The individual cells in a pack won't all be exactly the same capacity so cell voltage can drift, resulting in an individual cell overcharging or being drained too low. Is some form of battery management circuitry incorporated to even the cell voltages? Link to comment Share on other sites More sharing options...
SlowMo Posted November 28, 2015 Share Posted November 28, 2015 Yes many members have done it. You can put a second battery pack in parallel if you have the extra space so that you do not need to swap batteries. Just remember to have both battery packs charged at the same level before combining them. You will need 2 Y connectors for this process. You may need a dc to dc step down converter for 12v/5v output. Here is a link to a cheap 2900 mah Samsung battery pack being sold by Banggood.com. http://www.banggood.com/2900mAh-Electric-Unicycle-Battery-18650-16S-Lithium-Ion-Battery-60V-p-1006976.html Link to comment Share on other sites More sharing options...
esaj Posted November 28, 2015 Share Posted November 28, 2015 16 hours ago, Keith said: What I haven't got my head around, and maybe someone can help, is how the packs keep the cells balanced, I.e. The individual cells in a pack won't all be exactly the same capacity so cell voltage can drift, resulting in an individual cell overcharging or being drained too low. Is some form of battery management circuitry incorporated to even the cell voltages? Yes, there's a BMS (Battery Management System) -board inside the battery pack(s) that handles balancing of the cells as well as various protections (under-/overvoltage, overdischarge = overcurrent, short circuit, and sometimes temperature protection). The multi-pack configurations vary between wheels, for example Firewheels use only one BMS inside one of the packs, whether it's F132 (1 pack), F260 (2 packs) or F528/F779 (4 packs), and also the configurations are a bit exotic in those (16S1P for F132, 2 * 8S2P in series for F260, 4 * 4S4P in series for F528/F779). Some other multi-pack wheels might have a separate BMS in each pack. I've got 4 custom packs (16S1P) each with their own BMS, as I thought that'd be safer (a failure of a single pack won't mean complete power loss) and I can put them in and take them out individually, should I need to. Link to comment Share on other sites More sharing options...
uniler Posted January 3, 2016 Share Posted January 3, 2016 Can that battery from banggood be added to a 132wh battery even though it is a 174wh? Or is it best to get the same pack? Link to comment Share on other sites More sharing options...
Lovely Posted January 11, 2016 Share Posted January 11, 2016 its not the best idea to mix packs with different capacity and cells . it is best to get the same pack Link to comment Share on other sites More sharing options...
uniler Posted January 11, 2016 Share Posted January 11, 2016 That's what i thought Link to comment Share on other sites More sharing options...
Frankman Posted January 13, 2016 Share Posted January 13, 2016 No problem connecting in parallel a 174w battery to a 132W one. I have connected 3 battery packs in parallel one is 174W and other two are 132W each. The UC goes like a train and I've gained a lot of km more. Link to comment Share on other sites More sharing options...
Óscar Ramos Melero Posted February 17, 2016 Share Posted February 17, 2016 Thanks for all the info. I have a TG-T3 ( http://www.banggood.com/132Wh-T3-Electric-Wheelbarrow-Balancing-Unicycle-15-20km-Endurance-p-949305.html) and im looking for increase my kms.... I have a 132W battery. What its better. Another 132 W or increase to 174?? The only I need is the battery (http://www.banggood.com/2900mAh-Electric-Unicycle-Battery-18650-16S-Lithium-Ion-Battery-60V-p-1006976.html) and conectors fot batteries? Thank you for all Link to comment Share on other sites More sharing options...
Lovely Posted February 17, 2016 Share Posted February 17, 2016 If you have 132wh battery pack already, just add equal 132wh battery, preferably same brand, it won't be wrong I believe. Link to comment Share on other sites More sharing options...
Óscar Ramos Melero Posted February 17, 2016 Share Posted February 17, 2016 Thank you so much @Lovely! Now I havn´t the battery, but its in my Wishlist. A doubt that I have is not whether the two batteries (connected in parallel) can be charged at the same time (via connector unicycle) or if I have to charge the batteries separately. I'm looking to increase my autonomy kms !!! Thanks Link to comment Share on other sites More sharing options...
Lovely Posted February 17, 2016 Share Posted February 17, 2016 I am not a specialist, but as far as I know, if you connected these 132wh batteries parallel, you could charge them as the one battery pack, only charging time must be longer. Link to comment Share on other sites More sharing options...
Óscar Ramos Melero Posted February 17, 2016 Share Posted February 17, 2016 And when I have to connect it, the voltage will be aprox the same... but how many is te "aprox" difference? 10 volt? 1 volt? 0.1 volt? 0.01 volt? Link to comment Share on other sites More sharing options...
Lovely Posted February 17, 2016 Share Posted February 17, 2016 When you will have these two 132wh equal battery packs, just charge them on your unicycle, separately first time and when it's done they should have about the same voltage. Then connect them together in parallel. If both battery packs are brand new and fully charged, then its ok to connect them together in parallel, so they will balance each other. Link to comment Share on other sites More sharing options...
Lovely Posted February 17, 2016 Share Posted February 17, 2016 Each equal battery pack always will have a little bit different voltage, but if they have the same condition and charging level it should be acceptable to connect them together. Link to comment Share on other sites More sharing options...
esaj Posted February 17, 2016 Share Posted February 17, 2016 42 minutes ago, Óscar Ramos Melero said: And when I have to connect it, the voltage will be aprox the same... but how many is te "aprox" difference? 10 volt? 1 volt? 0.1 volt? 0.01 volt? I'd say aim for less than 1 volt of difference, the smaller the difference, the better. The batteries will "equalize" once connected, but if the voltage difference is large, there will be a large current rush between the batteries, which can cause overheating. Also the connectors shouldn't spark (at least as much) the lower the voltage difference is when connecting them. You can charge them through a single charge port as long as the current isn't too high, just parallelize the charging wiring also. If you are unsure about things, look around the forums or ask questions, the packs can be really dangerous if the connections are made wrong. Link to comment Share on other sites More sharing options...
Lovely Posted February 17, 2016 Share Posted February 17, 2016 You will need something like this, on the picture. Check your connections also. It would be good if somebody could confirm this! Yes, as esaj said, be very careful when working with the batteries! Also, if you will short plus and minus, by mistake, even for less than a second, there can be quite impressive fireworks and the connections can be destroyed in one click, and the melt, red hot metal could drop on your table or somewhere else. It is the best final, actually.. Link to comment Share on other sites More sharing options...
Óscar Ramos Melero Posted February 17, 2016 Share Posted February 17, 2016 Hace 1 hora, precioso, dijo: No soy un especialista, Pero por Lo que sé, si ha Conectado Estas Baterías 132wh paralelo, se podria cobrar Como el paquete De Una Batería, Solo El Tiempo de carga Dębe Ser Más Largo. I buyed cables but not battery. I buyed this: http://es.aliexpress.com/item/T-Converter-Plug-2-male-1-female-with-16AWG-Silica-Gel-Cable-L100mm/628941751.html and: http://es.aliexpress.com/item/1-to-2-RC-XT60-Dual-Extension-Parallel-Battery-Connector-Cable-for-DJI-Phantom/1840790605.html Link to comment Share on other sites More sharing options...
esaj Posted February 17, 2016 Share Posted February 17, 2016 3 minutes ago, Lovely said: You will need something like this, on the picture. Check your connections also. It would be good if somebody could confirm this! Yes, a parallel-connector like that is needed. Check that the connectors are the right kind (XT60 in the pictures is pretty usual, as far as I know). 3 minutes ago, Lovely said: Yes, as esaj said, be very careful when working with the batteries! Also, if you will short plus and minus, by mistake, even for less than a second, there can be quite impressive fireworks and the connections can be destroyed in one click, and the melt, red hot metal could drop on your table or somewhere else. It is the best final, actually.. You mean like this: I had earlier measured some currents with my multimeter, and forgot the measuring probe in the 10A -hole. Then I decided to check the battery voltage, shorting the plus and minus through the meter... BMS cut the power, didn't even blow the fuse on the meter (but it did melt the other probe and weld pieces of metal inside the connector as the probe head exploded into shrapnel). Yeah, these things pack quite a punch... luckily the shunting wire from the packs was already cut at this point. Link to comment Share on other sites More sharing options...
Óscar Ramos Melero Posted February 17, 2016 Share Posted February 17, 2016 I need XT60 and T-plug. Electic unicyvle XT60 male T-Plug male BATERY 132 XT60 Female T-plug Female NEW BATERY 132 XT60 Female T-plug Female Link to comment Share on other sites More sharing options...
Lovely Posted February 17, 2016 Share Posted February 17, 2016 Yes, absolutely ! That's what I mean! Look at this one as well ! Link to comment Share on other sites More sharing options...
esaj Posted February 17, 2016 Share Posted February 17, 2016 10 minutes ago, Óscar Ramos Melero said: I need XT60 and T-plug. Electic unicyvle XT60 male T-Plug male BATERY 132 XT60 Female T-plug Female NEW BATERY 132 XT60 Female T-plug Female Sounds like you then got the right connectors already. Just take care to check that the polarities on the batteries are right for the connectors (they should be, but it never hurts to check), and that the voltage difference is minimal before connecting them. 8 minutes ago, Lovely said: Yes, absolutely ! That's what I mean! Look at this one as well ! Haha, looks like I'm not the only one to do that mistake Sure taught me to check the wiring first before plugging the probes anywhere Link to comment Share on other sites More sharing options...
Lovely Posted February 17, 2016 Share Posted February 17, 2016 Link to comment Share on other sites More sharing options...
Lovely Posted February 17, 2016 Share Posted February 17, 2016 Thanks esaj, that you confirmed the important things, so another lucky man will upgrade his machine very soon! Link to comment Share on other sites More sharing options...
Óscar Ramos Melero Posted February 18, 2016 Share Posted February 18, 2016 exist is a telegram´s group on this issue? Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.