This came to our attention via a Google Alert and I thought I might stop by and give some input before you use our product in an application that it was not to be used. I hate to be the bad news guy, but this battery is not going to work in the application you are trying to use it in.
1. - The 12 Cell EVO2 is not a "deep cycle" battery. It is a starter battery. Our product is a lightweight, high performance starter battery meant for use in high performance vehicles.
I would highly recommend you read the FAQ section here: Ballistic Performance Components
2. - The 12 Cell EVO2 is a 6.9 Amp-Hours (A/hr) battery. Not a 20 A/hr battery. We do not recommend you use our batteries as an auxiliary battery because it only has a faction of the stock batteries A/hr capacity and if drained below its minimum voltage of 9.0 volts can become damaged.
You can see all the specs here: EVO2 12 Cell, Ballistic Performance Components
Ballistic Performance Part Number: 100-012
Parts Unlimited No.: 2113-0260
Dimensions (Metric): 114(L) x 87(w) x 112(h)
Dimensions (Standard): 4.5(L) x 3.5(w) x 4.25(h)
Negative Terminal Location:
Weight: 2.4 lbs
Voltage (Charged): 13.6V
Amp/Hours: 6.9 Ahrs
Burst Cranking Amps: 360 (5 sec @ 70°F)
OPERATING ENVIRONMENT: -18°C (0°F) to 60°C (140°F)
3. - You are correct that the EVO2 12 Cell has a static discharge rate of 10% per year, but the key to this phrase is "static." This means it won't discharge on it's own while nothing is drawing from it. If you are running accessories and plan to use those accessories while the vehicle is not running, then the those accessories will have much more dramatic effect on the EVO2 6.9 A/hr battery compared to the stock 14 A/hr battery.
4. - You will notice in the specs above that we only rate the battery down to 0F (-18C). Below this temp threshold the battery will not work at all. If you try to use it in -25C weather, then the battery will not work.
If you have a high performance vehicle that you want the absolute lightest, most powerful, starter battery available then the EVO2 12 Cell would be a great choice. If you have a Pioneer that you use in cold weather and you want to use the battery as an auxiliary battery outside of the charging system, you will be disappointed.