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Thread: BATTERIES BATTERRIES BATTERIES!!!!!!!!

  1. #11

    Default

    1. No they can charge Li-Ion batteries. Though its not give in the graph the strategy for charging followed by this IC is favorable to charge a Li-Ion battery.

    2. You can get the 33uH inductor from "coilcraft". Ask for free samples from them. I have successfully used them in past in white LED driving circuits.

    3. For power supply if you cant find a 25v wall supply get a printer power supply. It can provide you upto 32VDC

  2. #12

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    do you think the ic can handle 12.6 v li-ion

  3. #13

    Default

    Yes it can charge 12.6 v Li-ion

  4. #14

    Default

    good i have ordered samples for LT1512 and coilcraft, hope they arrive soon

  5. #15

    Default

    Coilcraft may call you and inquire further details. Actually they called me. But they have a good service.

  6. #16

    Default cheap solutions

    Hi frnds......

    I think its not really a good practise ti ask companies for free samples...as many a times because of this companies black list many countries and its hard to get samples when actually needed......

    This solution to chrging li-poly battery exixts its very cheap indeed....


    one can buy an external li-on charger we get these days mobil battery charges at mobil repair shops. These might not charge battery at very high charging current but seem preety good for the price I piked up mine for 60 Rs att alminton rd.......these are chinese good and when I opend it up I realizes it had a switching mode power supply...a small cob ic for charging the lithium ion battery...two small to-92 transistor (one for smps and one for chagring the battery...I gess the second transistor would be a switching transistor)....there were a 4 led and a couple of zenner and 4148 diodes...along with that.....se the pic of his charger .


  7. #17
    Member Android
    Join Date
    Oct 2007
    Location
    Mumbai
    Posts
    89

    Default

    Why ask for free sample ?

    Go thorough this link for li-on charger circuit using low cost LM 317 IC

    http://shdesigns.org/lionchg.html

    Regards,

    pratik

  8. #18

    Default

    hi asimov and pratik,

    well the problem is that the charger asimov told about isnt available everywhere and also i dont think it can charge 12.6 v 2000 mah li-ion battery ...

    pratik its a nice link you have given since i have never used it do u think it will be reliable and also will it be able to charge the above battery tyoe i told you about without exploding it ??

  9. #19
    Member Android
    Join Date
    Oct 2007
    Location
    Mumbai
    Posts
    89

    Default

    Hi,

    If u don’t wants to take a risk and build your own li-on battery charger then
    You can buy charger from Nex Robotics
    But they have only 8.4 v battery charger

    http://nex-robotics.com/viewCategoryList.php?cid=8

    Just ask robokits for 12.6 v 2000mah li-on battery charger as they sell the battery they mite have charger for it also .


    Regards,
    pratik

  10. #20

    Default

    ill try to do that i really dont trust a custom made charger its just too risky it would be a huge wastage if there is an odd connection in the circuit so i needed some links from where i can buy the charger for li-ion

    Nimh would also do like 12v 2000 mah nimh with charger but i guess u cant find them online in india

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