How to use scrap mobile battery for emergency light device Electronic experiment

In this video we have told that how to use scrap mobile battery in any device main?

[@mr.techinventor3463]

Wow

[@joshielectronicsoundsarwar3084]

doh battery को पेरनल में क्यों जोड़ा है

[@technicalmurli9790]

आपा एक बिट्टी भी लगा सकते hin