A circuit comprising: a switching element (232; 332; 432) configured to be connected between a positive terminal and a negative terminal of a first battery bank (210; 310; 410); and a capacitor (234; 334; 434), wherein the circuit (230; 330; 430) is configured to: draw, using the first switching element (232; 332; 432), a first current from the first battery bank (210; 310; 410) when the switching element (132; 232; 332; 432) is turned on, the first battery bank (210; 310; 410), due to an internal inductance (212: 312; 412) of the first battery bank (210; 310; 410), emitting an excess current after the first switching element (232; 332A; 432A) is turned off, wherein the first current increases a temperature of the first battery bank (210; 310; 410); deliver some of the excess current to a second battery bank (220; 320; 420) when the switching element (232; 332A; 432A) is turned off, wherein the excess current charges the second battery bank (220; 320; 420), and wherein the excess current increases a temperature of the second battery bank (220; 320; 420), and wherein the circuit (220; 320; 420) is further configured to: charge, using the excess current, the capacitor (234; 334; 434) while the switching element (232; 332A; 432A) is turned off; and discharge the capacitor (234; 334; 434) when the switching element (232; 332A; 432A) is turned on, the capacitor emitting a second current to the second battery bank (220; 320; 420), wherein the second current charges the second battery bank (220; 320; 420), and wherein the second current increases the temperature of the second battery bank (220; 320; 420). a switching element (232; 332; 432) configured to be connected between a positive terminal and a negative terminal of a first battery bank (210; 310; 410); and a capacitor (234; 334; 434), wherein the circuit (230; 330; 430) is configured to: draw, using the first switching element (232; 332; 432), a first current from the first battery bank (210; 310; 410) when the switching element (132; 232; 332; 432) is turned on, the first battery bank (210; 310; 410), due to an internal inductance (212: 312; 412) of the first battery bank (210; 310; 410), emitting an excess current after the first switching element (232; 332A; 432A) is turned off, wherein the first current increases a temperature of the first battery bank (210; 310; 410); deliver some of the excess current to a second battery bank (220; 320; 420) when the switching element (232; 332A; 432A) is turned off, wherein the excess current charges the second battery bank (220; 320; 420), and wherein the excess current increases a temperature of the second battery bank (220; 320; 420), and wherein the circuit (220; 320; 420) is further configured to: charge, using the excess current, the capacitor (234; 334; 434) while the switching element (232; 332A; 432A) is turned off; and discharge the capacitor (234; 334; 434) when the switching element (232; 332A; 432A) is turned on, the capacitor emitting a second current to the second battery bank (220; 320; 420), wherein the second current charges the second battery bank (220; 320; 420), and wherein the second current increases the temperature of the second battery bank (220; 320; 420). draw, using the first switching element (232; 332; 432), a first current from the first battery bank (210; 310; 410) when the switching element (132; 232; 332; 432) is turned on, the first battery bank (210; 310; 410), due to an internal inductance (212: 312; 412) of the first battery bank (210; 310; 410), emitting an excess current after the first switching element (232; 332A; 432A) is turned off, wherein the first current increases a temperature of the first battery bank (210; 310; 410); deliver some of the excess current to a second battery bank (220; 320; 420) when the switching element (232; 332A; 432A) is turned off, wherein the excess current charges the second battery bank (220; 320; 420), and wherein the excess current increases a temperature of the second battery bank (220; 320; 420), and wherein the circuit (220; 320; 420) is further configured to: charge, using the excess current, the capacitor (234; 334; 434) while the switching element (232; 332A; 432A) is turned off; and discharge the capacitor (234; 334; 434) when the switching element (232; 332A; 432A) is turned on, the capacitor emitting a second current to the second battery bank (220; 320; 420), wherein the second current charges the second battery bank (220; 320; 420), and wherein the second current increases the temperature of the second battery bank (220; 320; 420). charge, using the excess current, the capacitor (234; 334; 434) while the switching element (232; 332A; 432A) is turned off; and discharge the capacitor (234; 334; 434) when the switching element (232; 332A; 432A) is turned on, the capacitor emitting a second current to the second battery bank (220; 320; 420), wherein the second current charges the second battery bank (220; 320; 420), and wherein the second current increases the temperature of the second battery bank (220; 320; 420).