Hello, I noticed your conversation regarding our batteries (thanks Bill) and wanted to offer some assistance. Basement Yeti, we have
dozens of retailers in the San Diego area and the vast majority of our retail partners turn their inventory over relatively-quickly. I check our retailers all the time and it is rare to see a battery older than six months sitting on a shelf and our batteries can sit far longer than that. If you are concerned about the age of the battery you are purchasing, you can check the exact day our batteries were manufactured, by looking at the white, 1”x3” label on the side of the case. The first digit indicates the year of production, while the next three digits indicate the day of the year. For example, all batteries built today will start with “1196.”
A RedTop sounds like it will work just fine for your application, provided it is used as a starting battery and is properly-isolated from your BlueTop. Ronct110 also offers good advice about having your current RedTop charged and checked, before buying a new one. It is possible your battery is only deeply-discharged and may still be usable. Most battery professionals can run a load test on that battery for you and some will do it for free. They will need to attempt to fully-charge the battery first, before performing the test though.
The key to long battery life, regardless of brand, is proper voltage maintenance. Fully-charged our RedTops will measure about 12.6-12.8 volts and our YellowTops (and deep-cycle BlueTops) will measure about 13.0-13.2 volts. When any battery is discharged below 12.4 volts and allowed to sit in that state, sulfation will begin to diminish both capacity and lifespan. Keep a battery fully-charged and/or recharge it as soon as possible and it will provide better service for you. If you have any questions about our batteries, I'll do my best to answer them. I appreciate your interest in Optima batteries.
Jim McIlvaine
eCare Manager, OPTIMA Batteries, Inc.
www.facebook.com/optimabatteries