Iphone turns off after i restart and battery is dumb?

My iphones battery doesn't change and when i restart it updates then after 2-5 minutes it just turns off and keeps doing that and then it will randomly stop restarting and start working but the battery still remains the same

its an iphone 4s jailbroken if i reinstall ios will it fix?

Reinstall software.

You should definitely try to re-install the software. Maybe also try unjailbreaking it and then re-install the jailbreak.

http://supertechuser.weebly.com/

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