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Increasingly today, alternators are not meant to charge the battery, they are meant to replace that charge which the battery spent on starting, nothing more. Certainly not to 'deep charge' it. There are so many other electronic compenents in a car today that compete for the alternator output. This makes it more important than ever that your battery is in top form.
A bad battery can ruin an alternator in several ways; It makes the alternator work harder and longer, resulting in 'hotter' than it was ideally designed for. Also, the battery is supposed to act like a buffer to smooth out current fluctuations, if not in top form, it cannot do this and the alternator (or more specifically the diode pack, aka voltage regulator) suffers.
If it were me, I'd really consider a battery replacement along with the alternator.
Cheers!
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