Q: my i phone was dropped and i changed its battery now i need to activate it but  i forgot my apple id and password who can unlock my i phone 5 with IOS 8.1.3

Nobody can, but you can go online to Apple and re-set your Apple ID password.

https://appleid.apple.com/

You can get your appleID password reset at iforgot.apple.com

Use the links provided.

Recover your AppleID via https://appleid.apple.com/

Reset your password via iforgot.apple.com

If the iPhone is asking for an AppleID you do not recognize, the iPhone

is Activation Locked. Only the person who initiated the Activation Lock

can remove it. There is no workaround for Activation Lock.

No, there is not. You will not be able to activate the phone without the original ID and password.