Conventional pacemaker batteries

Solid-state and wet lithium cells have replaced the conventional Rubin-Mallory zinc/mereury pacemaker battery using aqueous NaOH solutions. Both types of lithium cell exhibit higher energy densities than conventional cells, e.g. Zn/HgO with 100 W h/kg > or 0.35 W h/cm or Zn/MnOj with 0.1 to 0.2 W h/cm " >, and a far longer shelf-life, e.g. a lead-acid battery exhibits a self-discharge rate of 1 % per day the Zn/MnOj-cell of 20 % per year... 

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