Is there a way to detect 1ms pulse with voltage of around 300mV?

[KS]

We are already using ADC for battery sense, also tried using ADC and LPCOM but could not get any reliable result.

[KS]

thank you for your reply. Yes, we are using an op amp and the gain is currently increased, our pulse now shoots to 1.5V still we are unable to detect such pulse in ADC or LPCOM. some reference will be appreciated thank you