MBP Shuts off Randomly when not plugged in

So, I've had a 2007 MBP and been very happy until just now.
My computer has started randomly shutting off. Not shutting down, but like "click" off when its not plugged in. This happens at different times, sometimes 5 minutes after its unplugged, sometimes 15, but it will.
Any ideas? Anything I can do? I don't really want to buy a new one because this one works just fine other than that.
Thanks

Seriously, look on the first page of this forum and you'll see other threads already started on the subject. No-one has a solution as yet, other than replacing the battery, even though it seems to be a software update (Snow Leopard or otherwise) that's the culprit.

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    Anonymous UUID:                    940E004E-E7B6-499D-A302-08CE583FBA76
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    0xffffff810bf233a0 : 0xffffff7f80a40b83
    0xffffff810bf23400 : 0xffffff7f80f5a0a5
    0xffffff810bf23430 : 0xffffff7f809b19bc
    0xffffff810bf23660 : 0xffffff7f8105d644
    0xffffff810bf236d0 : 0xffffff7f8105d851
    0xffffff810bf236f0 : 0xffffff7f80949a0d
    0xffffff810bf23780 : 0xffffff7f8094d69a
    0xffffff810bf23970 : 0xffffff7f8094e566
    0xffffff810bf23a50 : 0xffffff7f80b3ff2f
    0xffffff810bf23af0 : 0xffffff7f80b34ddc
    0xffffff810bf23c70 : 0xffffff7f808e54d7
    0xffffff810bf23ce0 : 0xffffff7f808d2c43
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    0xffffff810bf23fb0 : 0xffffff8000820057
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             com.apple.iokit.IOGraphicsFamily(2.3.4)[D0A1F6BD-E66E-3DD8-9913-A3AB8746F422]@0 xffffff7f80896000->0xffffff7f808cefff
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             com.apple.iokit.IONDRVSupport(2.3.4)[7C8672C4-8B0D-3CCF-A79A-23C62E90F895]@0xff ffff7f808cf000->0xffffff7f808e0fff
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[D0A1F6BD-E66E-3DD8-9913-A3AB8746F422]@0 xffffff7f80896000
                dependency: com.apple.iokit.IOPCIFamily(2.7)[5C23D598-58B2-3204-BC03-BC3C0F00BD32]@0xffffff 7f8086b000
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                dependency: com.apple.iokit.IONDRVSupport(2.3.4)[7C8672C4-8B0D-3CCF-A79A-23C62E90F895]@0xff ffff7f808cf000
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    com.apple.filesystems.smbfs          1.7.2
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.filesystems.autofs          3.0
    com.apple.filesystems.ntfs          3.10.1
    com.apple.driver.AppleMikeyHIDDriver          122
    com.apple.driver.ApplePlatformEnabler          2.0.5d3
    com.apple.driver.AGPM          100.12.75
    com.apple.driver.X86PlatformShim          5.0.0d8
    com.apple.driver.AppleHDA          2.2.5a5
    com.apple.driver.AppleMikeyDriver          2.2.5a5
    com.apple.driver.AppleUpstreamUserClient          3.5.9
    com.apple.driver.AudioAUUC          1.59
    com.apple.driver.AppleSMCPDRC          5.0.0d8
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.iokit.IOBluetoothSerialManager          4.0.8f17
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AppleSMCLMU          2.0.1d2
    com.apple.GeForce          7.3.2
    com.apple.driver.AudioIPCDriver          1.2.3
    com.apple.driver.ApplePolicyControl          3.1.33
    com.apple.driver.AppleLPC          1.6.0
    com.apple.driver.AppleMuxControl          3.1.33
    com.apple.driver.AppleMCCSControl          1.0.33
    com.apple.driver.AppleIntelHD4000Graphics          7.3.2
    com.apple.driver.AppleIntelFramebufferCapri          7.3.2
    com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.8f17
    com.apple.driver.AppleUSBTCButtons          227.6
    com.apple.driver.AppleUSBTCKeyboard          227.6
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          33
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.1.0
    com.apple.driver.AppleEFINVRAM          1.6.1
    com.apple.driver.AirPort.Brcm4331          561.7.22
    com.apple.driver.AppleSDXC          1.2.2
    com.apple.driver.AppleUSBHub          5.1.0
    com.apple.driver.AppleAHCIPort          2.3.1
    com.apple.driver.AppleUSBEHCI          5.1.0
    com.apple.driver.AppleUSBXHCI          1.1.0
    com.apple.driver.AppleSmartBatteryManager          161.0.0
    com.apple.driver.AppleACPIButtons          1.5
    com.apple.driver.AppleRTC          1.5
    com.apple.driver.AppleHPET          1.7
    com.apple.driver.AppleSMBIOS          1.9
    com.apple.driver.AppleACPIEC          1.5
    com.apple.driver.AppleAPIC          1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient          195.0.0
    com.apple.nke.applicationfirewall          3.2.30
    com.apple.security.quarantine          1.4
    com.apple.security.TMSafetyNet          8
    com.apple.driver.AppleIntelCPUPowerManagement          195.0.0
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.2.1
    com.apple.driver.DspFuncLib          2.2.5a5
    com.apple.iokit.IOSurface          80.0.2
    com.apple.iokit.IOSerialFamily          10.0.5
    com.apple.driver.AppleHDAController          2.2.5a5
    com.apple.iokit.IOHDAFamily          2.2.5a5
    com.apple.iokit.IOAudioFamily          1.8.6fc18
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.driver.AppleGraphicsControl          3.1.33
    com.apple.driver.X86PlatformPlugin          5.1.1d6
    com.apple.driver.AppleSMC          3.1.3d10
    com.apple.driver.IOPlatformPluginFamily          5.1.1d6
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.nvidia.nvGK100hal          7.3.2
    com.apple.driver.AppleSMBusController          1.0.10d0
    com.apple.NVDAResman          7.3.2
    com.apple.iokit.IONDRVSupport          2.3.4
    com.apple.iokit.IOGraphicsFamily          2.3.4
    com.apple.driver.AppleUSBBluetoothHCIController          4.0.8f17
    com.apple.iokit.IOBluetoothFamily          4.0.8f17
    com.apple.driver.AppleThunderboltDPInAdapter          1.8.5
    com.apple.driver.AppleThunderboltDPAdapterFamily          1.8.5
    com.apple.driver.AppleThunderboltPCIDownAdapter          1.2.5
    com.apple.driver.AppleUSBMultitouch          230.5
    com.apple.iokit.IOUSBHIDDriver          5.0.0
    com.apple.driver.AppleUSBMergeNub          5.1.0
    com.apple.driver.AppleUSBComposite          5.0.0
    com.apple.driver.AppleThunderboltNHI          1.6.0
    com.apple.iokit.IOThunderboltFamily          2.0.3
    com.apple.iokit.IO80211Family          420.3
    com.apple.iokit.IONetworkingFamily          2.1
    com.apple.iokit.IOUSBUserClient          5.0.0
    com.apple.iokit.IOAHCIFamily          2.0.8
    com.apple.iokit.IOUSBFamily          5.1.0
    com.apple.driver.AppleEFIRuntime          1.6.1
    com.apple.iokit.IOHIDFamily          1.7.1
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          177.11
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.driver.DiskImages          331.7
    com.apple.iokit.IOStorageFamily          1.7.2
    com.apple.driver.AppleKeyStore          28.18
    com.apple.driver.AppleACPIPlatform          1.5
    com.apple.iokit.IOPCIFamily          2.7
    com.apple.iokit.IOACPIFamily          1.4
    Model: MacBookPro10,1, BootROM MBP101.00EE.B02, 4 processors, Intel Core i7, 2.3 GHz, 8 GB, SMC 2.3f36
    Graphics: NVIDIA GeForce GT 650M, NVIDIA GeForce GT 650M, PCIe, 1024 MB
    Graphics: Intel HD Graphics 4000, Intel HD Graphics 4000, Built-In, 512 MB
    Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533642465238432D50422020
    Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533642465238432D50422020
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xEF), Broadcom BCM43xx 1.0 (5.106.198.19.22)
    Bluetooth: Version 4.0.8f17, 2 service, 18 devices, 1 incoming serial ports
    Network Service: Wi-Fi, AirPort, en0
    Serial ATA Device: APPLE SSD SM256E, 251 GB
    USB Device: hub_device, 0x8087  (Intel Corporation), 0x0024, 0x1a100000 / 2
    USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x8510, 0x1a110000 / 3
    USB Device: hub_device, 0x8087  (Intel Corporation), 0x0024, 0x1d100000 / 2
    USB Device: hub_device, 0x0424  (SMSC), 0x2512, 0x1d180000 / 3
    USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0262, 0x1d182000 / 5
    USB Device: BRCM20702 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x1d181000 / 4
    USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8286, 0x1d181300 / 6
    USB Device: USB Receiver, 0x046d  (Logitech Inc.), 0xc52f, 0x14200000 / 1

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      Device name:          bq20z451
      Pack Lot Code:          0000
      PCB Lot Code:          0000
      Firmware Version:          0201
      Hardware Revision:          0002
      Cell Revision:          0164
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      Charging:          No
      Full charge capacity (mAh):          5078
      Health Information:
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      Condition:          Normal
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      Amperage (mA):          -917
      Voltage (mV):          11235
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      Disk Sleep Timer (Minutes):          10
      Display Sleep Timer (Minutes):          5
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      Wake On LAN:          Yes
      Display Sleep Uses Dim:          Yes
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      Disk Sleep Timer (Minutes):          10
      Display Sleep Timer (Minutes):          1
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      Current Power Source:          Yes
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      Reduce Brightness:          Yes
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      Charging:          No
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