Was the second battery charged when you put it in? I had a Dell laptop that would work fine plugged in to the mains but would not charge the battery or when i tried to run it on just the battery it would die straight away, I took it to a computer shop and it turned out the battery was knackered.
I was told this was because I always ran the laptop on the mains and never used just battery power, i was told you need to run it on battery power every now and then and change something in the settings so it only charged the battery up to 80% when it did charge the battery.
after this advise i was quoted over £100 for a genuine Dell battery which was probably more than what the sodding laptop was worth so I never got it sorted!
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