Use a li ion charger circuit between that particular solar panel and the li ion cell.
Charging 3 7v battery with solar panel.
Voltage of solar cell 1 5 x voltage of battery so 3 7v to 4 2 v of li ion is equivalent of 5 55 v to 6 3 v of solar cell.
Will a 6v 5w solar panel charge a 3 7v 4300mah battery.
4 4 out of 5 stars 233.
So you can choose 500 mah solar cell or 1 ah solar cell.
For li ion battery i choose solar cell with 5v and 160 ma.
Each solar charger comes equipped with a cn3791 power tracking battery charging circuit and pre installed four 2 pin jst ph2 0 connectors.
I soldered a 2x 3 5 0v make certain you use a 5 0v solar panel on ebay amazon solar panel to a tp 4056 on ebay lithium ion battery charging board.
Charge initially yes but then kaboom.
For choosing solar cell you must choose.
To charge a battery with a solar panel connect a charge connector to the solar panel.
D o n t d o i t.
The output is soldered to a 18560 battery.
It s just that the solar cell must generate at most 4.
Then run wires from the battery to the charge connector making sure to match the positive and negative poles.
If the cn3791 mppt solar charger is 9v version you must use the solar panel working voltage is 9v.
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Having said that it is possible to charge a li ion cell directly from a solar panel.
4 bay usb speedy charging smart battery charger fit for solar panel universal intelligent charger usb output port for 3 8v 3 7v 18650 26650 14500 16340 rcr123a lifeo4 1 2v ni mh ni cd aa aaa battery.