Leaderboard

A new battery, huh? Did you bench charge it before installation? I don't mean with a trickle charger, but with a smart charger capable of at least 2.0A/hr. It typically takes 6-10 hours of bench charging at such low & slow rates to initially charge a 10AH battery (OE - YTZ12S/YUASA) to its full (and likely future ) capacity. If you didn't bench charge it first, remove the battery, check the cells electrolyte levels, and check the no-load charge level. Now let it sit for a few hours (if your garage is too cold, bring it inside and let it come to room temp). Now try bench charging with an appropriate charger. If you're using a smart charger you can let it charge overnight - it won't overcharge. Take a voltage reading after charging. As redxxrdr and superhawk996 said, a no-load reading of 12.7-13.5v usually means a happy battery. Per the shop manual, 12.3v or below indicates a battery beyond hope - replace it. Here are some helpful links . . . https://www.ronayers.com/oemparts/a/hon/506c2064f870023420a2f7ac/battery https://www.amazon.com/Yuasa-YUAM3RH2S-YTX12-BS-Battery/dp/B000WK4CS4/ref=sr_1_2?s=automotive&ie=UTF8&qid=1541266738&sr=1-2&keywords=2003+Honda+CBR1100XX+12v+battery+YTX12-BS https://www.amazon.com/Ampeak-Battery-Charger-Maintainer-Automatic/dp/B07DD8BJ9V/ref=sr_1_11?s=automotive&ie=UTF8&qid=1541266804&sr=1-11&keywords=12v+battery+charger+smart (not an endorsement - just cited as an example) It pays to do some research and comparison shopping. Best of luck!