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What kind of juice?
some flavors will cause issues with plastic tanks (normally they leak on the outside - commonly called cracking)
mint, citrus, cinnamon and cola flavors to name a few
Does it occur most often after it has been lying on it's side?
some clearos over wick juice when the vacuum inside is broken.
if this is the cause just get creative and make a stand for your battery - I have shop full of tools, so I just drill holes in scrap lumber, for those without tools, hobbyist clay, make whatever shape you want, wrap the end of your battery in clear cling wrap, push into clay to make proper size hole - wiggle it around to make it oversized for ease of use (more if baking - it will shrink up some) make sure you pull out the clear plastic (this is used to keep clay from being forced into the battery)
oh, and
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