If your battery is dropping to those voltages you most likely have a bad cell or two in the battery. Start the bike check the voltage the bike should be around 13 plus volts then wait a few minutes and while you have the volt meter attached turn the bike off you should only drop down to 12 volts if it drops down to 4 volts as before then your battery is bad.
Good luck.
01 CBR929 Erion "Hers" Full High EXT Yosh TRS, SS Undertail, PCIIIusb, Custom Map, Flapper Mod, PAIR Mod, GPR, Polished rims, Frame Sliders, SS Brake Lines.
01 CBR929 RR "His" -1 Front +2 Back, Full High EXT Yosh TRS, SS Undertail, Intergrated Tail light Blinkers, PCIIIusb, Custom Map, Flapper Mod, PAIR Mod, GPR, Polished rims, Frame Sliders, Speedo Healer, SS Brake Lines, Ohlins Forks
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