Q: MAcbookpro gets really hot doesnt hold battery life for long

MBP Battery Troubleshooting: To check for a bad battery, go to Apple/About This Mac/More Info In the System Profiler window, select the Power entry & look for Health Information. If next to Condition it says "Check Battery" then your battery is probably on the fritz.

FAQ:  Apple notebook batteries – maintenance and troubleshooting

User Tip:  How to deal with MacBook Pro and MacBook heat?

Apple Portables: Tips for maximizing your battery charge

Also see this Apple article that mentions both overheating and short battery runtime:

Runaway applications can shorten battery runtime, affect performance, and increase heat and fan activity - Apple Support

You may open your MBP and check inside.  Often an older MBP will have dust and debris inside that promotes retaining heat.  If so clean it out.  Pay attention to the fans.

Ciao.