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2013 model s 90

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I was wondering if anyone else was lucky like me to get a brand new 90kw battery in a 2014 or older model s. My 85kw battery went bad 6 months ago I was told they were going to give me a refurbished 85 in a few weeks turns out they no longer doing refurbish on any older batteries. After 6 months I was told I was going to be getting a brand new 90kw. Sure enough today I had it installed. Already I'm seeing over 30 more miles at my current 90% charge. I also fell I accelerate faster.
 
Might be a stupid question - how does one know that the pack is bad? As in, what are the typical symptoms before I take it to a SC, which in my case is 100+ miles away from me. I have an 2012 S85 and notice some strange sounds from the pack but would be good to know the typical symptoms? Thanks.