What the Numbers and Letters on a Battery Mean (motorcycle battery part numbers)

This post contains a breakdown of maintenance free, gel and lead acid motorbike battery part numbers.
The motorcycle battery part numbers are commonly used examples of motorcycle battery part numbers with a brief explanation of what the letters and numbers mean.

Maintenance free batteries

Battery reference (YTX12-BS) What the reference means
Y Manufacturers mark, different manufacturers use different letters
T Manufacturers mark, different manufacturers use different letters
X High performance battery
12 Indication of performance level of battery (lower numbers equal lower power output)
 
B Type of terminal or supplied with acid bottle
S Sealed battery or supplied with acid bottle
Battery reference (YTX14L-BS) What the reference means
Y Manufacturers mark, different manufacturers use different letters
T Manufacturers mark, different manufacturers use different letters
X High performance battery
14 Indication of performance level of battery (lower numbers equal lower power output)
L Polarity location (which way round the terminals go)
 
B Type of terminal or supplied with acid bottle
S Sealed battery or supplied with acid bottle

Gel filled batteries

Battery reference (YTZ12-S) What the reference means
Y Manufacturers mark, different manufacturers use different letters
T Manufacturers mark, different manufacturers use different letters
Z High performance battery
12 Indication of performance level of battery (lower numbers equal lower power output)
 
S Polarity location (which way round the terminals go) and configuration
Battery reference (YT7B-4) What the reference means
Y Manufacturers mark, different manufacturers use different letters
T Manufacturers mark, different manufacturers use different letters
7 Indication of performance level of battery (lower numbers equal lower power output)
B  
 
4 Polarity location (which way round the terminals go) and configuration
Battery reference (YT7B-BS) What the reference means
Y Manufacturers mark, different manufacturers use different letters
T Manufacturers mark, different manufacturers use different letters
7 Indication of performance level of battery (lower numbers equal lower power output)
B  
 
B Type of terminal or supplied with acid bottle
S Sealed battery or supplied with acid bottle

12 Volt lead acid batteries

Battery reference (YB16AL-A2) What the reference means
YB Manufacturers mark, different manufacturers use different letters
16 Indication of performance level of battery (lower numbers equal lower power output)
A Indicates a different size of the same capacity battery
L Polarity location
 
A Location of the opening for the venting exhaust
2 Type of terminal
Battery reference (Y50-N18L-A2) What the reference means
Y Manufacturers mark, different manufacturers use different letters
50 Cranking or starting power (higher number means more power)
 
N Vented type battery
18 Indication of performance level of battery (lower numbers equal lower power output)
L Polarity location
 
A Location of the opening for the venting exhaust
2 Type of terminal
Battery reference (12N12A-4A-1) What the reference means
12 Battery voltage
N Vented type battery
12 Battery capacity at a 10 hour rate
A Indicates a different size of the same capacity battery
 
4 Polarity location
A Location of the opening for the venting exhaust
 
1 Type of terminal

6 Volt lead acid batteries

Battery reference (6N2-2A-1) What the reference means
6 Battery voltage
N Vented type battery
2 Battery capacity at a 10 hour rate
 
2 Polarity location
A Location of the opening for the venting exhaust
 
8 Type of terminal

Maintenance free battery

Disclaimers:
The information provided on this page is ‘to the best of our knowledge’ and should not be taken as 100% accurate!!

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