YT4B-BS Battery Cross Reference
A YT4B-BS is a sealed agm (maintenance-free). It fits 13 powersports models in our data, and a lithium drop-in is made in the same case size.
AGM is the safe like-for-like: cheapest, tolerant of standard chargers and trickle tenders, and heavier. Lithium (LiFePO4) drop-ins in the same case size cut weight by roughly 60-70%, hold voltage better, and self-discharge far slower - but they cost more and need a lithium-aware charger, not an old lead-acid trickle charger.
Buy the battery for your YT4B-BS battery
AGM is the safe like-for-like: cheapest, tolerant of standard chargers and trickle tenders, and heavier. Lithium (LiFePO4) drop-ins in the same case size cut weight by roughly 60-70%, hold voltage better, and self-discharge far slower - but they cost more and need a lithium-aware charger, not an old lead-acid trickle charger.
As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
What takes a YT4B-BS
Motorcycle
Frequently asked
What vehicles use a YT4B-BS battery?
A YT4B-BS fits 13 powersports models in our data, including the Suzuki DR Z50, Suzuki DR-Z70, Yamaha SR400. It is a sealed agm (maintenance-free).
Is there a lithium equivalent to the YT4B-BS?
Yes. LiFePO4 lithium drop-ins are made in the YT4B-BS case size, so they fit the same tray and terminals. They weigh far less and last longer, but need a lithium-aware charger.
What does the YT4B-BS code mean?
The -BS suffix means it ships dry with an acid pack you add once - after that it is a sealed, maintenance-free AGM battery.