changed battery - now hardly anything works

[mikefocke]

doesn't affect ability to start.

And the vent tube connection would depend on the make/model of the battery. Some have a vent tube connection, some don't.

[gschotland]

First rule out the battery by getting it tested by a shop or big chain like Autozone. If it's iffy, just replace it. For a 1.5yr old battery you may have a warranty that will cover part of the cost of a new one.

[DANMKII]

Do you have a voltmeter? I would check to see if the battery have the necesary 12.5V.

Does it attempt to turn over? Might be the starter? check the fuse as well.

I had to trouble shoot last summer and found out it was my cars ALT fuse & the starter. Go figure.