As I will be using 2 capacitors, I have the choice to put them in series or parallel, with benefits on each choice. The capacitors I have are 2.5V 310F Ultracapacitors from Maxwell.

First of all some formulas :

Where C = capacity (Farads), Q = charge (Coulombs), U = Voltage(Volts), W = Work/Energy (Joules).

If I put the 2 capacitors in parallel, the overall voltage will stay 2.5V, but I'll have 620F in total. Which means I'll have a charge of 1550 Coulombs (Q=C*U), and a stored energy of 1937.5 Joules. As it is "only" 2.5V, it can have some trouble pumping the required current through the circuit (as I=U/R), but it's easier to charge as I won't have to "balance" the two capacitors as in the "series" option.

If I put the 2 capacitors in series, the overall voltage will become 5V, and the total capacity will become 155F. At the end that means I'll have 755 Coulombs of charge, but still 1937.5 Joules of stored energy. Because it's 5V, it could pump more current through the circuit (as I is still equal to U/R), but the overall charge won't be as high as the "parallel" option.

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TL;DR ? Here's a quick table :

Option : | **Parallel** | **Series** |

Voltage : | 2.5 Volts | 5 Volts |

Capacity : | 620 Farads | 155 Farads |

Stored charge : | 1525 Coulombs | 755 Coulombs |

Stored energy : | 1937.5 Joules | 1937.5 Joules |

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So yeah, I don't really know which one I'll be using yet, so I'll do some testing ^^