Advice on led rechargeable batterey for trident

[K Rex]

I need a little direction on where to get the battery for this glowing trident I extend on casting.
Needs to be wireless small battery pack so I can mold it right in and recharge it through the resin. Anyone know where I can get this type of recharging battery pack that I can connect or Sauder to a let strip.
Thank you all!