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  1. Richard_Electronics

    Charging different types of batteries ?

    Yea i understand that it will be very slow charging if i charge car batterys with 50and more Ah.. but i have got lot of 12v 4Ah lead acid batteries wich will take 2 hours in perfect conditions to charge with 2A charger (if is not just power supply 12v) Problem is that battery is much smaller...
  2. Richard_Electronics

    Charging different types of batteries ?

    I think this is my fault.. I have never tought about battery tipes.. i just didn't care.. Sorry don't get mad im just a amateur.. Inglish not rili gud :P ~~ I used to charge 12v Lead battery with a big, old and heavy car battery charger (output 11.6v but when is connected to charged battery...
  3. Richard_Electronics

    Charging battery with level indicator ?

    Here, i have one simple question and i hope solution can be simple too. I have a charger for car battery, a car battery and a battery level indicator(for 12v battery). My car battery charger does not have a battery level indicator build in so there is no way to see if battery is full without...
  4. Richard_Electronics

    Cooling electronic circut ?

    Thanks for your help. I solved the problem by "attaching" circuit to heat sink with pc cooler which is taking electric energy from 12v battery true circut which is converting to 4.5v and taking only 0.070A so i can use it without any drastic changes on voltage/amperage. Without fan: 4.5v and 3A...
  5. Richard_Electronics

    Cooling electronic circut ?

    Here is the link of seller, he told me next: "The module is very small so will heat up for short period of time." Its price is ~1$ so it makes no sense to pay 50 bux fo cooling, im sure there is cheaper way. BTW circut's size is equal to nail.
  6. Richard_Electronics

    Cooling electronic circut ?

    i didn't wanted to damage it so i stoped using it after it vas ~50°C the seller told me that converter is not suposed to work longer time because of heating if i burn this one will have to wait for other converter 40 days for shipping :P
  7. Richard_Electronics

    Cooling electronic circut ?

    Hi. I have this Step down converter: https://prnt.sc/hhthh3 and i have problem... I need to use it for 3-6 hours (for long time) but it is heating up, i don't want to damage it or burn it so if there is a way to cool it while in use some how i will be happy to hear solution recommendations :D...
  8. Richard_Electronics

    Sealing Lead Acid Car Battery.

    Oh damn i need something that will let air true but keep acid inside, like filter.
  9. Richard_Electronics

    Sealing Lead Acid Car Battery.

    Question was how to seal opened lead acid battery. (stuff about charging is not important now) Thanks!
  10. Richard_Electronics

    Sealing Lead Acid Car Battery.

    Yea i know everything is best when you buy new but im trying to repair it. The battery is pretty much new (bought from store before 3 months in that case there is no need for rejuvenate). Previous owner has opened it because he wanted to charge the battery(he is old gen man and have never used...
  11. Richard_Electronics

    Connecting car battery to a portable speaker.

    on backside of the speaker is written 3W, battery may be near death but i don't need to know all that, i will just use fuses in case something goes wrong. But first i need to wait for parts to appear from seller.
  12. Richard_Electronics

    Sealing Lead Acid Car Battery.

    Hey well, i have a car battery VARTA A14 12v 40Ah CCA:330... And for some reason its previous owner cracked opet 4 holes (it was Sealed Lead Acid Battery before he opened it) the plastic is cracked and there is no any caps for holes, i covered it with cloth made of synthetics so dust can't go...
  13. Richard_Electronics

    Connecting car battery to a portable speaker.

    Well.... Im not making DIY speaker. The speaker is made by verified manufacturer im just making additional battery because im not happy with 4.5v 2000mAh build in battery(9Wh witch is playing 45 minutes.. With My 12v 3Ah it has 36Wh witch should play for ~3 hours).
  14. Richard_Electronics

    Connecting car battery to a portable speaker.

    Output power of speaker is 3Watts
  15. Richard_Electronics

    Connecting car battery to a portable speaker.

    Thank you for help :D
  16. Richard_Electronics

    Connecting car battery to a portable speaker.

    Yea im 100% sure that red is positive but i want to know where i need to put fuse.. on positive or negative wire ? And is it better to use Fast Blow fuse or Slow Blow ?
  17. Richard_Electronics

    Connecting car battery to a portable speaker.

    Is the feed line positive wire(red) ?
  18. Richard_Electronics

    Connecting car battery to a portable speaker.

    Hi, im about connecting car battery to a portable speaker, as title says. I'm amateur in electronics so i need help... I have Kymco GTX4L-BS battery (not sure where it is from) Specs: 12v 3Ah (10HR) CCA: 50A (I have also "VARTA A14" 12v 40Ah 330A(en) wich i want to use for same purpose if is...
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