I am assuming overcharge/overheat/etc protection will kick in and stop charging worst case.
Updated overclocking code based on huanyu and michyprima's versions.
Still overclocked by default to 1113MHz but can be pushed to 1152MHz with SetCPU.
Custom compiling with EXOVERCLOCK can now go to 1305MHz though I wouldn't recommend it.
I find it unlikely any gain would be worth the risk of shortening the life of your CPU.