I don't think it's even possible. The term "battery" may not be the apprpriate one to use here, it's more of a "constant electrons generator", than a battery per se. Betavoltaic batteries just keep "creating" electrons, at a constant rate, for a long time. You can't simply "create" 1000 times more electrons on a single moment and release it suddenly. These things are a lot safer than lithium ion batteries when you look it from this angle.