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I have one 18650 cell which has a nominal voltage of 3.1 V in the specs. Right now, it is discharged and reads 2.8V. I was wondering if I can charge it directly with a panel solar (18V) until it reaches 3.2V and then disconnect it. A higher voltage difference means a higher current, right? My solar panel can deliver max 0.5 A in theory and the cell can be charged with 1C (2.6 A) so I am not worried that the current is too high, but what about the voltage difference? What can happen if I charge it with higher voltage?

Physther
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  • What does the data sheet say? – Leon Heller Mar 03 '18 at 08:55
  • Why would you think it is sensible to charge a 3.1V cell with 18V ? – Solar Mike Mar 03 '18 at 08:59
  • Well, they recommend CC/CV. So constant current until the voltage has reached the highest value, then keep voltage constant. – Physther Mar 03 '18 at 09:03
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    After reading this: https://electronics.stackexchange.com/questions/230155/why-is-there-so-much-fear-surrounding-lipo-batteries and watching the videos I have decided not to develop my own circuits. I have bought a USB Li-Ion charger at the same time as the lipo cells. – Oldfart Mar 03 '18 at 09:54
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    &Physther So, with that logic why not just use the mains at 230V just rectify it ? Don’t try ... – Solar Mike Mar 03 '18 at 10:59
  • I asked a question because I wasn't sure. Please correct my logic if it is wrong and/or if you wish to. Otherwise we can go in chat and do this kind of game. – Physther Mar 03 '18 at 12:04

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