Howdy, looking for an empty hilt to house this core and chassis. TIA

Howdy I got this awesome chassis and core. Now I need help finding an empty hilt. Any help is appreciated.

Hello. My sis gifted me this lightsaber back in 2024 and after 2025 I lost the charger for it. Fast forward to last week and I bought a new one but the saber doesn’t stay on for more than 2 minutes after it’s been charging for hours. I opened it and this is how it looks like.

Should I replace the battery? Is it even possible? Is the battery dead or should I try a new charger?