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That'll be the CP-E4 battery pack then, it takes 8 batteries rather than the 4 that the flash holds & gives you a faster recycling time.
Amazon have them at £144, you can get after-market ones cheaper, Amazon have one made by Pixel UK for £51 and Quantum make them but they are a few hundred quid, you buy a battery pack & a cable for your particular flashgun. I think they range from £200- £400 depending on how powerful you want your battery pack.
Or you could just get a load of NiMH rechargeables (high powered ones, maybe 2400 mAh plus) if you don't need superfast recycling times
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