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Issue in sim808 of power down mode

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nicsjasani

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Hello all,

i have one issue in sim808 module.

1) when i connect VBUS pin to the +4.1Vdc and connect battery to the VBAT pin sim808goes in power down mode when i disconnect it external battery.

2) When i connect VBUS pin from +5V dc continuous supply(charger) and connect battery to VBAT pin my sim808 restart continuously.

i have Li-Ion 3.7V dc battery.

3)and also tell me what would be the exercise if i dont want to connect battery. and sim808 works only on external power source(+4.1DC).

4) if there is no solution without connecting external battery please let me know how do i automatically get it in normal mode after power down mode when battery fully discharge and i connect it with external supply.
 

hi hamid, it works.
thanks for it.

but i have doubt that if i want to connect battery then what should i do and where should i connect it (also want to prevent battery from over voltage charging).
 

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