To go on what motor?? and how much electronics is also being placed on it??? Be sure to look at the dates on the battery and take you a digital voltage meter with you. If it isn't 12.6 volts at least, leave it alone. Don't get a battery more than 4 months old, get one with lots of RC (reserve capacity). Myself, I don't/won't spend money on optima batteries when a wet cell lasts just as long and twice/3 times cheaper.