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  1. W

    what maked a gel battery charger great battery charger (for wheelchair) 2x 12v

    hi i used to have a charger i could move a button to select gel or lead . i dont have it anymore. the one i have is lighter and smaller see pic but it does not seem specific to gel batteries. it has no button to switch or select the type of battery to be charged yes i can charge with it but a...
  2. W

    how to interpret this data? something is not working

    Hi 2 years ago i did this soldering test battery prototype. it has been laying with bms plugged in for 2 years. the battery was made with some ok not perfect used vtc4 and vtc3 cells. 13 2p. 13 of each this week i tried to plug my xiongda and controler(i think it is a kt not sure) . i...
  3. W

    what is the minimal safe voltage not to go under for good life span battery and storage voltage.

    hello. i build a prototype with used vtc4 2 years ago 13s 2p. i bought a mini lunacycle charger with option 80% 90 % 100 % and 12345 amp i read that charging at 1 amp is better for life span so that point is ok if im not mistaken the life span is lesser if i charge the battery to 100% . it...
  4. W

    need help to create a piece that fits on my bike and that will host regular trailer

    Hi i have a xiongda motor and none of the nuts on of trailer fit on that so i have been suggested to build a piece of metal to fix on the bike and frome there add the regular attachement from the trailers. i have never done something like that . Someone suggested me to use the holes on my bike...
  5. W

    is there a prob in this battery diy plan with prebuid case?

    HI i want to buils a 13s 4p with vtc4 sofar the kwelt spot welderseems the cheapes solid way with precut purenickel stipes i want it to be water proof i have my own bms i plan to use 2 layers of this 0.15 mm nickel prefab sloted stipes one on top of another for better conductivity ? ill...
  6. W

    can i place a bms inside this case ?

    HI i finally found a kit that has pure nickel with it. i need to know if my bms will fit and where. i have 52 cell (13s4p) and the case is made for 13s5p(65cell) so MAYbE i can fit my bms in it the BMS is 12cm by6.5 cm by2cm. WiCH cell emplacements should i not use to fit the bms and not...
  7. W

    how do you solder without seeing?

    hi i ask the community for if they know pure nickel sheet that fit the ebike case and holder but i received not answers... So... from what i understand , people use 7 or 8 mm 0.15 pure nickel strips. OK... but how to you guys know that you are weldining all 4 points on the positive circle...
  8. W

    comparison li po li ion for trolling motor fishing

    HI could someone estimate the price of those 2 options for a 100 amphour battery how many 18650 would it take 4s?
  9. W

    wich torq arm for this bike

    HI i have a norco yorkville hybrid in aluminium taht dates from maybe 10 years i dont know. i ll put a hub motor at the back wheel. i search for a good bang for buck what info do you need me to provide in order to give me good advice? tx
  10. W

    what desing is best for this battery

    i am searching for a kit case holder nickel and i already have my bms i would take a 70 cell case even if i have 52 cell to have space. wich cell position should i take out to have space but have a good electric setup for 13 s4p? feel free to erase the ones one the pict
  11. W

    what is the consequence of non pure nickel

    hi i search a kit that has battery case, holder and presloted nickel i would choose a 70 cell to be sure that a 13s4p fit with the bms. the nickel i look is non pure, what does that imply for futur? aestical problem or fonctionnal problems? iwould of course prefere purenickel
  12. W

    cost estimation qte power house with 18650

    Hi Maybe there is a post i haven t found yet where someone has done the calculation of cost of electric photo pannel and battery to power a house regular. time it lasts, pros and cons, tx
  13. W

    building battery, searching for a battery with nickel holed sheet that fits

    hi i saw that it is easier to solder when there is a small slot . I want that cause ill be able to see where i solder. can anyone tell me if there is a case kit with holder and nickel sloted sheet somewhere or a nickel sheet that fits with a battery case. tx
  14. W

    how many amps should i plan for a Diy battery and which nickel strips?

    How many amps minimum should i plan when construction a battery that opens for possibilities for future project needs? I am planning my welding sheets… and i have a need for knowledge so here are some questions if you can help me i would greatly appreciate . My firts motor will be xiongda so...
  15. W

    which vendor sells pure oblique nickel strip trusted

    hi who made the nickel tests to confirm a seller on aliexpress maybe sells pure nickel stipes (2 parralle)? ill use a 70 cell case like the one below. how many meters do i have to buy for 1 battery like this...
  16. W

    i need advice on choose a good solid case with nickel

    hi I have 52 vtc4 separated cells . i will build 13s 4p battery and will use already purchased waterproof bms see link below . i want a lockable case that is solid ,i ll put it on top of a regular rear luggage thing over the back wheel. i dont need the charging parts of the the case. cause...
  17. W

    DIY Arduino Battery Spot Welder et 48 v?

    HI i do not have any battery car. i do have a 48v 13s2p vtc4 cell. i want to spot weld need battery using nickel stips. what can i use? can i use DIY Arduino Battery Spot Welder? is it compatible the last version
  18. W

    how to choose a good battery case ?

    HI I have a need for clarity before buying a battery case. i m building abattery and i already have my bms and i would like to choose a solid waterproof(if possible) case that i can securly leave on my bike when i go to the groceries. Either on top of a normal rear rack or where the water...
  19. W

    how to protect hub for winter and salt and water

    hi We have a lot of snow and ice in my country. and a lot of SALT is added on the streets. my hub will stay on my bke permanently winter and summer so it will be exposed to everything I just bought a xionda motor and before installing it on my bike i would like to know What can i do to...
  20. W

    whick lock (empty) case for diy lion do you suggest

    hi before i was thinking of placing my 13s4p in a bag but i realise that it would be much more practical to have it in a case i can lock on my bike. i need a base empty , if possible metal or something good against fire and rain. it need to lock with a key and have the support i do my own old...
  21. W

    best fireproof case/ system or DIY to store/charge lipo liion safest way

    HI for ebike battery pack like 1000 wathours energy which is normal size battery for ebike I spend lots of time reacherching and it is unclear, lets help each other 1first option is ammunition metal case with seals out(to prevent pressure buiding up explosion) . THe videos i saw show this was...
  22. W

    amunition case fire case bags

    HI i saw that some people use Usa ammunition case metal boxe to charge and store their battery. They say that if there is a fire, it will be contained. Im not sure about that. What do you think about that ? how many holes to you drill in those metal case? (need at least one for the...
  23. W

    how to seal the positive "Y" end of a diy batt

    hi i did a prototype of an batterie. all wires are soldered except for the positif one . i dont know how long i need to leave before the Y and how to do the Y. when i say Y i mean that somehow i wire becomes 2 wire (one for charge the other for power) I see 2 ways of doing it . the first is...
  24. W

    how to know it ithere is a faulty cell or paralele groupe in my diy pack

    hi i ll solder a 4p13s with a bms. i tested all my cells and the are ok . in each parale groupe there are cell from 4,15 to 4,10 vol so a 0,05 v difference. 1 is this 0.05 v difference within a parallel group ok? 2what will happen if i have a bad luck and one of the cell dies ? will the...
  25. W

    how to plan the positif part of my diy pack

    what is he best way and avandgte disadvantage of those ways. 1 y at beginning 2 the cable positive goes in and out a module 3 y at the end
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