Battery drain

HP Envy x360 15m-ee0023dx Windows 10 64-bit 2 years old This has happened twice so far, first time I thought maybe I forgot to plug it in First time, I turned my laptop off for the night at 30ish percent battery, and didn't use it until the next evening. It turned on, but immediately said...

I have a Lenovo G40-70, i5 4th gen, 12 GB RAM. After 3 months of use, it started turning off while on battery with no warning notification or sound. I can't even use it for 20 minutes max. The battery might read 50%-90% and suddenly is drained to 0% and turns off. I don't think it shuts down...

I used my phones 1A (ampere) charger for my mother's Intex aqua 3g pro phone and it charged the phone faster than usual. But after using that, the battery started to drain fast like 1% for every 3 minutes. And if internet is on then it discharges 1%for 1 min. Can anyone tell me the problem...

Last night I accidentally drained my laptop. I had it configured to do nothing when battery power was low. Now my laptop doesn't boot and the screen stays black. However, the laptop turns on, led lights work, fans are blowing. But keyboard is unresponsive and when I attach second monitor it...