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  1. K

    How do i solder this tab?

    Nice tutorial. I feel it worth emphasizing that the best, lowest-resistance electrical connection is achieved when there is firm contact between the battery-or-circuit-board-or-whatever contact point and the wire or copper sheet BEFORE solder is applied excepting only a thin layer of nicely...
  2. K

    Air transport of dangerous lithium ion batteries

    1. Review the extended thread at the top of this Forum, on lithium battery shipping rules, second thread in the Forum. 2. Ask the shipper, ie the carrier. The entity selling/sending the goods may answer differently than the carrier and has been known to distort the rules in their own interest.
  3. K

    Coil Spring connectors ?

    I'm interested to know how you envision stacking the cells. I have had similar thoughts to yours, but built nothing, I have envisioned cells stacked like in a flashlight, in a thin-walled tube--preferably plastic, but metal like electrical conduit or copper plumbing pipe could be used with...
  4. K

    Lithium running out?

    Well you can hear all kinds of silly things if you listen in the wrong places. How about a citation for that piece of misinformation that you heard, rather than just passing on a rumor that you heard? As the Former Guy was fond of saying while asserting misinformation, "people are saying," but...
  5. K

    How to charge (3) 12v SLA batteries in series

    I disagree that you cannot charge them in series, with a 36V charger. Consider this: A 12V lead-acid battery is already 6 2V cells in series. They are charged as a series unit, not as individual 2V cells. Consider that many trucks and buses have 24V systems, and the 2 12V batteries are...
  6. K

    Is a little rust normal for nickel strip in salt water

    Check it with a magnet.
  7. K

    Charging toys from solar??

    Modern pure sine wave inverters are very efficient. There is an efficiency tax but it is modest. You may find it more suitable to use one than to invent a solution that is custom to your needs but has no other utility; you can run your TV, computer, and whatever within its power rating...
  8. K

    Is this useless due to bottle necking the power?

    PS you may find it instructive to read all the comments below that XT-90 UTube.
  9. K

    Is this useless due to bottle necking the power?

    Here is a UTube on your XT-90 connector. https://www.youtube.com/watch?v=4rcCdCVBXAI You can see that it will handle well in excess of 90A for short periods. The ratings of electrical components are generally for steady-state use, and can be safely exceeded for short periods. I would assume...
  10. K

    Is this useless due to bottle necking the power?

    Resistance of #10 copper wire is very close to 1 ohm/1000 ft, or .001 ohms/foot. For a 1' length of #10 in a circuit carrying 200A, by Ohm's law E = IR, voltage drop E = 200 x .001 = 0.2V. This is what you would measure with a voltmeter connected to the two ends of the 1' section with 200A...
  11. K

    Is this useless due to bottle necking the power?

    The voltage drop or power loss in a section of conductor can be measured, or calculated using Ohm's law. It took me many years to understand the operation of Ohm's law as well as I do now, and would take longer than I am going to spend typing to give you a tutorial; I expect there are good ones...
  12. K

    10w solar panel connected to lead acid battery

    You and LeftieBiker are both correct, thanks. There's a good chart here https://batteryuniversity.com/learn/article/how_to_measure_state_of_charge if you scroll down a little. Note that measurement is best if the battery has been at rest (no load and no charging) for a while, they say 24...
  13. K

    10w solar panel connected to lead acid battery

    By (imperfect) memory, it is fine to "float" flooded lead acid batteries at about 13.3V or less. That means you can leave them on indefinite trickle charge at that voltage, to maintain a fully charged state. You can probably verify this figure at the Battery University website. For...
  14. K

    DC Load test large battery packs. Rheostat?

    Thanks, but the rheostat is variable up to say 10 ohms so i should be able to set the resistance to 1.2 ohms :D I will check the video. Thanks!! If you have a 10 ohm rheostat capable of dissipating (say) 100W and you set it to 1 ohm, it has only 10W capability at that setting. It will burn...
  15. K

    Will running an AC motor directly from a 52v battery hurt the battery/BMS?

    Well none of the better experts have shown up so I will dive in. Mostly, need more info. AC motors will not run on DC. At all. You say you have done it, please say exactly what you have done. What tool, what motor type, with what result. Many tools use AC/DC or "universal" motors. These...
  16. K

    Active cooling for battery pack

    Do you want to connect adjacent nipples like the red lines, or non-adjacent like the clear tubing picture? Either way, find a cooperative auto parts person and look for an existing molded rubber hose that will work as-is or cut to suit. Hose clamps to taste, spring-type probably better than...
  17. K

    70$ Li-Ion Battery Pack 48V 10.5Ah 500w output

    Seller has posted here as eequip1 and then as eequip2. Apparently they lost the password for the first account, so can't access mail to eequip1. Try responding to eequip2 and I think you will get an answer.
  18. K

    70$ Li-Ion Battery Pack 48V 10.5Ah 500w output

    HELP! Has anybody reading this thread had contact with the seller eequip1? Or eequip2, the ID has changed mid-thread? Anybody have an email, phone number, company name, real name, any way to get in touch? I would like to buy some batteries. I have sent multiple messages to eequip1 through the...
  19. K

    70$ Li-Ion Battery Pack 48V 10.5Ah 500w output

    Please, how to buy these? I do not see any contact information in the thread. I have sent two messages through the ES PM system but no response, maybe that system is not working? Please email me kansasgarage@gmail.com Frustrated would-be customer.
  20. K

    Test a battery pack. How can i easily create a high amp load?

    Buy 4 50W 12V halogent bulbs, connect in series and you get 200W 48V 5A load. Thats how I test my batt. Awesome! I will try this :) It will be a cheap test. Thanks. So the resistance over one 12v, 50w halogen bulb is really low? Something like 2.5 ohms (2.5x4=10 ohms)? I=48v/10ohms=4.8A Use...
  21. K

    Charged car battery to 15V. What H2SO4/H2O ratio to refill?

    CORRECTION to my post above. Sulphuric acid as used in batteries is diluted with water to about 35%, reported numbers vary so apparently there is a range, possibly depending on various battery designs/specifications. Pure sulphuric is quite viscous.
  22. K

    Charged car battery to 15V. What H2SO4/H2O ratio to refill?

    Too many unanswered questions here. Is the 15V shown with charger attached and turned on? (I think yes but not sure.) What is the voltage after 24 hrs off the charger? How are you judging reduced capacity of the battery? Is a sealed battery or old-style with six removable caps you can...
  23. K

    Fuse Questions

    Here's a fuse tutorial. https://www.littelfuse.com/~/media/electronics/product_catalogs/littelfuse_fuseology_selection_guide.pdf.pdf
  24. K

    Where can i get such a weldable Blade receptacle

    How about you measure the blade of the Male mate to the connector shown, cut some tin of similar thickness (slightly thicker OK) to that width, weld that to the battery, then use the Female connector to mate to the welded tin strip?
  25. K

    What do you think of this situation and how can I be safer?

    I suggest you start research on safe, tested and approved battery charging by appealing to your local fire department, which can guide you to the information. Advice to "just stick it in a metal box" may be sufficient, or not. I think you will find it worth the effort to insure your security...
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