Hatsan Spark

So I have a Hatsan Spark and I have only used it a few times. So far the whip that came with it won't work. I have replaced "O" rings and used Teflon tape on all the fittings. Still have to use the whip off my 50 dollar hand pump.

So today the temp gauge don't work. The instructions I got are not for the Spark but another compressor but it says if the temp gauge don't work the batteries are dead, put in new batteries. Cool,I know about batteries but what I don't know is how to get to the old batteries.

Can anyone tell me how to change batteries on a Hatsan Spark

Also are the whips listed on Ebay worth buying?

Thanks for any replies

God Bless

Bobby