Are you asking about a "Gel Cell" or "Absorbed Glass Matt" (AGM) battery.
There are major differences in the design. Most of the batteries that we
would consider are AGM.
Basically in these batteries there is no free liquid. The electrolyte is
absorbed in the matting between the plates. They usually can be mounted in
any position except upside down. They do have some means of venting. They do
need to be carefully discharged and charged and if they vent they will dry
out and fail.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Paul Gordon
Sent: Friday, November 20, 2009 5:34 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Gel Cell's

Anyone ever had an "Negative Experience" mounting these on their sides. They
claim not to spill, But what about leakage. I think I can get a larger
battery this way but not sure about installing it on it's side.Any insight
would be helpful.