You won't get an original battery as manufacturing for same has stopped. You will have to opt for duplicate batteries.
Its just a April fools prank. Nothing to worry about. It will be removed in next update.
If you want to manually remove it than follow the steps...
There are no further updates or support of Oxygen OS for Oneplus One. Best rom you could try are Linage OS or RR.
This can also be a battery problem. Does the phone boot up while connected to charger?
Are you trying to reset in setting menu or in custom recovery?
Most probably its battery issue. Try changing the battery!
Did you try changing battery? It worked for me.
Its battery issue. Change your battery and it will be fine.
Pretty sure its battery issue. Try replacing your battery.
Changing the battery is the only option.
1) You should try Lineage OS or RR!
Thanks man. Will get it replaced in few days.
Oh thought so. But do service center have batteries for OnePlus One in Stock? Last i checked they didn't.
Now a new problem has started. While trying to install OS from twrp device restarts. Not able to install OS also now.
And now it wont even go to TWRP...