Lithium battery discharge problem.

Discussion in 'General Electronics Chat' started by imraneesa, Oct 4, 2016.

  1. imraneesa

    Thread Starter Member

    Dec 18, 2014
    184
    4
    Dear sir/madam,

    i have made one voltage boost circuit. my input is 3 of 3.7v lithium batteries. they are always connected to the circuit. and the circuit is then connected to another circuit with 555 chip in it.
    as long as i off the switch i am fine. but by mistake if i leave the switch on and even though the switch for the lights is off the battery keeps draining slowly. How can i avoid the lithium batteries not drain beyond certain point. like say 3v so 3 x 3v is 9v.
    if my lithium batteries over discharge they are not charging back. Please help to solve this small problem.
    thank you in advance.

    Best Regards,
    Imran
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,094
    3,033
    You need a low voltage cutout. It's hard to say more without a schematic.
     
  3. AlbertHall

    Well-Known Member

    Jun 4, 2014
    1,897
    375
    A boost converter will draw a small current even if it has no load on it. To avoid that you must disconnect the battery from the converter. Some converters have a shutdown pin and if it is shutdown that way it will draw negligible current so that is an alternative way of reducing the current.
     
  4. ian field

    Distinguished Member

    Oct 27, 2012
    4,413
    782
    Maxim do a variety of off the shelf voltage monitor chips.
     
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