What charger do I need for this?

Hi @lambpotpie ,

Here is one.

Just search for Motorola X Sol Republic Deck charger to find suppliers that suit you best.
Looking at the image of the charger in the link, the charger specs are DC output 5V 2.5A and it looks like it has a micro USB plug.

Basically any 5V DC phone charger with a micro USB plug should also charge the speaker but most only have an DC output of 5V ~1A so it will take longer to charge.

if you decide to try using a phone charger check the specifications printed on the charger to verify the DC output voltage is 5V (important) and to a lesser extent the current (in Amps - A)