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It’s more possible the alternator was the problem and that’s what killed the first battery.

If it’s not putting out 13 Volts to the battery them the alternator is most likely bad.

Drive it with no accessories on for 20 min. and if you can find a voltage gauge that just plugs into your cigarette lighter see what that reads at speed.

But it really sounds to me like your alternator was the real problem that killed the battery.

Unless you have a bad connection between the battery and ground, at the battery or at the ground.

Or from the pos. to Starter, check all connections.
 

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Before you go and just buy a new alt. take it off and have it tested.

Most parts stores do it for free.
 
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