K4 battery

Hi, wondering if anyone has come across this before. My K4 battery is struggling to fire when connected to the tank. If I unscrew the tank the battery light comes on as normal but when I connect it the fire lasts a second or 2 then fades out to nothing. If I leave it half hour or so I get a few good fires then same again. Is this a common problem? Any solutions? Thanks in advance.
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