YTX20L-BS · 3 min read
YTX20L-BS Battery: Dimensions, Polarity & Equivalents
Dimensions, polarity, what the name means, similar battery codes and the replacement battery.
Maintenance-free AGM · YTX20L-BS
12 V, 18 Ah battery with 240 A cold cranking amps, replacing the YTX20L-BS. Factory-activated and charged, ready to fit. Positive terminal on the right.
€47.73 VAT included · Satkit price checked on 7 October 2026
Prices incl. VAT checked on 7 October 2026; they may change.
This is a direct replacement for the YTX20L-BS: the same voltage, polarity and battery case. It leaves the factory with the electrolyte inside and charged, so there is no acid pack to fit or waiting around: check the voltage and fit the battery.
Use a smart motorcycle battery charger, with a recommended charge current of about 1.8 A (capacity divided by 10) and never more than 3 A.
Dimensions, terminal layout and similar battery codes: YTX20L-BS battery part number page.
Related guide
YTX20L-BS · 3 min read
Dimensions, polarity, what the name means, similar battery codes and the replacement battery.
Buying guide · The basics · 16 min read
To get it right, you need four details: the battery part number, dimensions, which side the positive terminal is on, and cold cranking amps and capacity that match or exceed the original. Here’s how to find each one, which battery type suits your motorcycle, and how to look after it so it lasts.

Maintenance-free AGM · YT12B-BS
12 V, 10 Ah battery to replace the YT12B-BS. Sealed gel technology, maintenance-free. Positive terminal on the left.

Maintenance-free AGM · YTR4A-BS
12 V, 2.5 Ah battery with 50 A cold cranking amps, replacing the YTR4A-BS. Sealed gel technology, maintenance-free.

Maintenance-free AGM · YTX20-BS
12 V, 18 Ah battery with 300 A CCA, replacing the YTX20-BS. Sealed gel technology, maintenance-free. Positive terminal on the left.