YTX4L-BS/YTX5L-BS Motorcycles Lithium Battery 12V 2.5Ah 150CA with Smart BMS, YTZ5S-BS/YTZ6-BS, High-Rate Cell, Powerful Starts, Compatible with Motorcycles, Generator, Small Lawn mower

2 years now with this:https://www.amazon.com/dp/B0BZRML4W3?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_24&th=1 Going strong stil. And it weighs almost nothing, it's kinda strange but it's been great.