Buying guide · Motorcycle batteries
Where to find the battery code, how to measure your battery, which side the positive terminal is on and which type suits your motorcycle. A page for each battery code, with its replacement.
Search by battery code
Dimensions, polarity, what the code means, similar codes and replacement options. Find the battery code on your battery’s label.
By vehicle type
Your vehicle determines the battery code; how you use it determines the technology. Here’s what matters for each one.
01 — Scooter
Long periods parked and short journeys call for a sealed AGM that holds its charge well. Add a battery maintainer if it’ll be parked for weeks.
02 — Road motorcycle
Choose starting power to suit the engine size. If the original is a YTZ, choose another YTZ: more starting power in a compact case.
03 — Classic
Often fitted with a conventional flooded battery (YB, 12N) or a 6 V battery. Fit a sealed battery only if the voltage regulator/rectifier charges at 14.0–14.8 V.
04 — Quad and personal watercraft
For vibration, tilting, moisture or cold, choose a factory-activated AGM that won’t spill. In snow, prioritise cold cranking amps and avoid lithium.
Batteries
AGM and gel batteries by code, with dimensions, polarity and cold cranking amps. Prices include VAT at satkit.ie, which publishes this guide.
Maintenance-free AGM · YTX9-BS
12 V, 9 Ah battery with 135 A cold cranking amps, a replacement for the YTX9-BS. Factory-activated and charged, ready to fit. Positive terminal on the left.
High-performance AGM · YTZ10S
12 V, 9 Ah battery with 170 A cold cranking amps, replacing the YTZ10S. Factory-activated and charged, ready to fit. Positive terminal on the left.
Maintenance-free AGM · YTX7L-BS
12 V, 7 Ah battery with 75 A CCA, replacing the YTX7L-BS. Supplied factory-activated and charged, ready to fit. Positive terminal on the right.
Maintenance-free AGM · YTX14-BS
12 V, 12 Ah battery with 200 A cold cranking amps, compatible with the YTX14-BS. Factory-activated and charged, ready to fit. Positive terminal on the left.
Replacement for conventional battery · YB12AL-A2
12 V, 12 Ah motorcycle battery with 165 A CCA, replacing the YB12AL-A2. Factory-activated and charged; ready to fit. Positive terminal on the right.
High-performance AGM · YTZ7S
12 V 6 Ah battery with 100 A cold cranking amps, replacing the YTZ7S. Supplied activated and charged, ready to fit. Positive terminal on the right.
Side by side
Three batteries with a 150 × 87 mm footprint and the positive terminal on the left when viewed from the front. Check the height and starting power before swapping one for another.
| Feature |  | | |
|---|---|---|---|
| Equivalent to | YTX7A-BS | YTZ10S | YTX9-BS |
| Height | 94 mm | 93 mm | 105 mm |
| Capacity (10 h) | 7 Ah | 9 Ah | 9 Ah |
| Cold cranking amps | 105 A | 170 A | 135 A |
| Type | AGM | High-performance AGM | AGM |
| Price at Satkit | €20.28 | €32.48 | €24.35 |
Common questions
Check the label on your battery (front or cover), the specifications section of your manual or the manufacturer’s parts catalogue. If the label has worn off, measure your battery.
They’re the same size, but the terminals are reversed: the L version has the positive terminal on the right. With the wrong one, the cables may not reach or could be connected the wrong way round.
Yes. More Ah and higher cold cranking amps give you extra headroom, as long as the dimensions, polarity and terminals match the original.
OUTDO AGM batteries arrive factory-activated and factory-charged: there’s no need to fill them. Check the voltage; if it’s 12.8 V or higher, fit the battery as it is.
Only if you want to save weight, the weather is mild and you have the right charger. Cold reduces its starting power, and it can’t be used with lead-acid chargers that have a desulphation mode. AGM suits almost every situation.
Guides
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.
Practical guide · Diagnosis · 5 min read
The motorcycle won’t start and the battery is the prime suspect. Before replacing it, five minutes with a multimeter will tell you whether it’s dead, simply discharged or whether the charging system is at fault.
Practical guide · Dimensions · 4 min read
If the label has worn off or you want to check that a replacement will fit, five minutes with a tape measure will tell you everything: the three dimensions, the positive terminal position and the terminal type.
Practical guide · Charging and winter storage · 6 min read
Motorcycle batteries rarely die of old age: they die because they are left discharged. Here’s how to charge yours properly, how often to do it and what to do to get it through the winter without losing capacity.
Buying guide · Technologies · 6 min read
Four technologies that fit in the same space on your motorcycle but behave very differently in everyday use. Find out what really sets conventional, AGM, gel and lithium batteries apart, and why AGM is the right choice for almost every bike.
