Maybe i should clarify, my intent was not to run a smaller battery in power, only in size. I want stock battery abilities in the smallest package possible.
Ah, you seek the grail. Just like all the electric car advocates.
Battery technology is on the verge of breakthough toward that goal (has been for 10 years now
), but it is not readily available yet.
i have found a 12v 10Ah this size: 5.94" L x 2.56" W x 4.37" H
and the same but in 21Ah in this size: 7.14" L x 3.03" W x 6.59" H
If you plan on using the electric starter, you must add another specification to your search parameters, and that would be CA or CCA or Cold Cranking Amps. Starting batteries have a different plate and separator technology used within the battery. Starting batteries maximize plate area and contact with the electrolyte (sometimes with thinner plates). This allows them to deliver higher currents than their power durability rating (such as what you have posted). However, because of the "more open" plate and separator design, their life is shortened by deep discharging. Deep cycle batteries, on the other hand, have a plate and separator design that promotes depositing lost metals during discharge, mostly back where the metals came from, while recharging. Such batteries do not deliver high currents of starting motors very well, without heating, distorting, or damaging the current crop of deep cycle battery plate and separator technology designs. Conversely, deep discharging a starting battery frequently, removes metal from the plates and allows holes to form in the plate material far sooner as metal is not redeposited onto the plates during recharge where it came from on the internal plate.
Please note that the starter motor on the SOHC4 draws 150 amps or more during start operation. This draw is well beyond the rating specs you've listed. A starting battery can supply this load and still maintain a usable voltage to power the ignition components. A Deep cycle battery used in this same application will drop the voltage more during starting operation, which may or may not effect you ignition system's spark capability when the battery is new. However, as you increase the amount of time that a deep cycle battery as been overloaded, it will have more difficulty supplying the amps that the starting motor demands AND the voltage delivered during the high amperage draw will get lower. So, while it may still spin the starter, it will do so slower and the spark voltage will get lower as well. Of course, it the spark potential gets low enough, spark does not occur. You may still kick start the bike with a weakened battery, and turning the lights off on the bike would help the spark voltage potential.
however, from all the sites i've looked at (a lot now), 3" is about the "thinnest" i can get keeping within or above the 12-14Ah minimums.
A 12 V 14AH battery, ostensibly, can sustain a 14 amps load for 1 hour. (Ah, if life could be that simple.) However, the voltage will not be maintained at 12v for that entire duration. As the time advances the voltage depletes (to zero). In fact, the battery will not be usable for that entire 1 hour duration, as that is a calculated rating, not a demonstrated rating. Instead, the battery is designed to deliver 1.4 amps for 10 hours (if the spec was using a 10 hour rate) before the battery voltage level depletes to 10.5V. If the spec was using a 20 hour discharge rate, you could place a 0.7 a load on the battery for 20 hours before the output falls to 10.5V.
Note this excerpt from:
http://www.logwell.com/tech/shdwe/vehicle_battery.htmlBattery Ratings
There are a dozen or more vehicle battery rating methodologies. The Society of Automotive Engineers (SAE) has established two ratings for domestic made batteries - Reserve Capacity (RC) and Cold Cranking Amperes (CCA). The Cranking Amps (CA) rating is also still commonly used. Industrial batteries often specify Ampere Hours (AH) and marine batteries may carry a Marine Cranking Amps (MCA) rating. Definitions of these more common rating systems are given below:
RC - Rating in minutes a battery will carry a 25 amp load at 80ºF and maintain a minimum terminal voltage of 10.5 volts.
CCA - Rating in amps which a new, fully charged battery at 0ºF can continuously deliver for 30 seconds and maintain a terminal voltage equal to or higher than 1.20 volts per cell.
CA - Rating in amps which a new, fully charged battery at 32ºF can continuously deliver for 30 seconds and maintain a terminal voltage equal to or higher than 1.20 volts per cell.
AH - (@ 20 hours) a battery having a 100 AH rating must carry a 5 amp load for 20 hours and maintain a terminal voltage of 10.5 volts at 80ºF (100 ÷ 20 = 5 amps).
MCA - Rating in amps which a new, fully charged battery at 30ºF can continuously deliver for 30 seconds and maintain a terminal voltage equal to or higher than 1.20 volts per cell.
Ratings Conversions: RC = 1.75 x AH AH = (RC ÷ 2) + 15.5
Cheers,
