Medium-Distance Travel of Electrical Pulses over a Wire
Twisted pair will be around 200 Ohms as seen by pulse edges, coin cell will be around 2kohm but reduced with an e-cap for pulses.

A LiPo has an ESR &lt;30 milliohms so obviously a better solution for app. use time as well.  Hope that helps. 

Make sure to use twisted pair and consider ferrite sleeve or balun or CM choke for long cables. Also include ESD protection or OVP or TVS diodes to gnd and Vcc. We had a similar fault 30 yrs ago fixed by diode clamps to Vdd,Vss with UTP in a home between uC.