I don't know what the battery warranty was for 2013 Model S, but the current warranty is 8 years or 150,000 miles, not 10 years. Also, the warranty specifically excludes:
"...Despite the breadth of this warranty, damage resulting from intentional actions (including intentionally abusing or destroying your vehicle or ignoring active vehicle warnings or service notifications), a collision or accident (excluding from Battery fires as specified above), or the servicing or opening of the Battery or Drive Unit by non-Tesla or non-certified personnel, is not covered under this Battery and Drive Unit Limited Warranty.
In addition, the Drive Unit is subject to the exclusions and limitations described in this New Vehicle Limited Warranty. Damage to the Battery resulting from the following activities is also not covered under this Battery and Drive Unit Limited Warranty:
• Damaging the Battery, or intentionally attempting, either by physical means, programming, or other methods, to extend (other than as specified in your owner manual and any documentation provided by Tesla) or reduce the life of the Battery;...."
Previously, they actually spelled out the exclusion still covered in the wording above that: "Leaving your vehicle unplugged until it discharges the battery to at or near zero state of charge" is excluded.