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As u r using 3.7v battery but if we want to use 6v 4.5ah battery to connect it with this circuit u r showing and use a 3W 8.97v 3A solar panel to charge the battery.
This is use for lithium ion battery not for lead acid battery
As u r using 3.7v battery but if we want to use 6v 4.5ah battery to connect it with this circuit u r showing and use a 3W 8.97v 3A solar panel to charge the battery.
This is use for lithium ion battery not for lead acid battery