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My question is very simple, can i charge 18650 li-ion cell by using transformer-less power supply. this transformer-less power supply convert AC current to DC current by using just capacitor, resistor and diode. This power supply has only three components. Will it be safe and good life span for my single 18650 cell.

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    \$\begingroup\$ no. and even the smallest amount of research should have shown you that you need a current- and voltage limiting charger to charge lithium batteries. There's literally a hundred questions on this site that ask how to charge lithium batteries. \$\endgroup\$ – Marcus Müller Aug 31 at 15:17
  • \$\begingroup\$ transformer-less can never be safe (unless it is in a plastic box so no one can touch the electronics). Also if you have to ask "how to charge an 18650" you need to educate yourself first. \$\endgroup\$ – Bimpelrekkie Aug 31 at 15:21
  • \$\begingroup\$ /@MarcusMüller thanks sir confirming me.I think i have to use different type chemistry of cell. because now project power supply and cell protection module cost will reach more than project itself. Even It has no space at all. I am again where I had started. \$\endgroup\$ – Mahesh Gupta Sep 2 at 14:22
  • \$\begingroup\$ @Bimpelrekkie thanks dear confirming me.I think i have to use different type chemistry of cell. because now project power supply and cell protection module cost will reach more than project itself. Even It has no space at all. I am again where I had started. \$\endgroup\$ – Mahesh Gupta Sep 2 at 14:23
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No it will not, you have to have circuit charges and monitors voltage, current and temperature within the batteries specification you also need to have at least one over current protection circuit at least, preferable with a fuse aswell.

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  • \$\begingroup\$ thanks dear confirming me.I think i have to use different type chemistry of cell. because now project power supply and cell protection module cost will reach more than project itself. Even It has no space at all. I am again where I had started. \$\endgroup\$ – Mahesh Gupta Sep 2 at 14:21
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No, you need a proper Li-ion battery charger to charge such batteries safely. Don't even try charging them with a generic power supply; it is dangerous.

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  • \$\begingroup\$ thanks dear for confirming me.I think i have to use different type chemistry of cell. because now project power supply and cell protection module cost will reach more than project itself. Even It has no space at all. I am again where I had started. \$\endgroup\$ – Mahesh Gupta Sep 2 at 14:21
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Thanks a lot for replies. I think i have to use different type chemistry of cell. because now project power supply and cell protection module cost will reach more than project itself. Even It has no space at all. I am again where I had started.

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