Coinspeaker Panasonic Plans to Boost Energy Density of Tesla Batteries by 20% in Five YearsPanasonic announces plans to boost the energy density of the battery cells it supplies to Tesla by 20 percent in five years. TSLA stock is 0.15% down to trade around $1,496 at the time of reporting.Panasonic Plans to Boost Energy Density of Tesla Batteries by 20% in Five Years