Proto #1 Solitons are powered by coin cell Lithium Ion batteries. It is very important to insert the battery with the right polarity.
Failure to insert the battery correctly is a fire hazard since it will certainly lead to overheating of the battery which will also cause irreversible damage to a Soliton.
Such damage to Solitons is not covered by warranty and you will need to purchase a replacement from the Store. Note - Proto #2 Solitons do not feature replaceable coin-cell batteries.