When I bought my '85 eighteen months ago
it came with a used battery, which has given good service.

Several times lately, usually after the van has sat for five
or six days without starting, the engine doesn't start *right*
up like it used to.  There is a hesitation before it turns over.
Is this symtomatic of a worn out battery?

(I had a new starter installed eighteen months ago, & six
months ago a new ignitions switch.)

Advice much appreciated, as always!
Cheers,
Phaedra
'85 Wolfsburg Westy