Premium Member wessie Posted May 2, 2015 Premium Member Share Posted May 2, 2015 As it seems we have had summer and autumn is with us now it's May, I had the seat off my bike to meddle. I noticed there is a 2cm spacer at the base of the battery (the opposite end to the terminals as it is lay in one side). You can see the grey foam spacer in this picture I took when writing up my seat mod, next to the red fuse holder. So, with my electrical engineer's hat on, I went to the ever useful Tayna website to get the dimensions of the Yuasa YTZ10S fitted to the bike. These are 150mm x 87mm x 93mm. It is the 93mm dimension that has been added to by the spacer. The electrical specification of the Yuasa YTZ10S is a capacity of 8.6Ah and it has 190 CCA (cold cranking amps). My battery has VRLA written on it which means valve regulated lead acid. This means the battery is either a gel type or an AGM (absorbed glass mat) type. Everything you need to know about VRLA batteries is in this useful wikipedia article. A VRLA battery is important as once sealed they will not leak, hence being able to fit it on it's side. So, I decided to look up which batteries are available with the same 150x87mm dimension but a height of 110mm or less. Again using the ever so useful Tayna website that lets you filter by each of the dimensions and the very important VRLA/AGM I found the Yuasa YTZ12S or YTZ14S will fit. They are both 110mm in height. Spec: YTZ12S, 215 CCA and 11Ah YTZ14S 230CCA and 11.2Ah It seems Yuasa does not make these batteries now, but there are alternative makes available including some very good brands like Westco, Varta and Motobatt. Hopefully it will be quite some time before anyone needs a new battery. The original Yuasa was still on my Super Tenere when sold, it was 5 years old and had done 20,000 miles. It rarely needed a charge as the bike was used all year and the AGM technology is great at keeping a charge if not used for a couple of weeks or even months. The reason I have written this thread now is that some owners who live in cold climates and use the bike over winter may find upgrading to a battery with 40 more cold cranking amps makes starting on very cold morning easier. Those who do short journeys or run a lot of accessories may find having the extra storage capacity of the 11Ah battery could mean there is less need to put the battery on to charge at night. For those in the UK, a genuine Yuasa YTZ10S replacement is about £70 from the MDS shop on Ebay. Tayna will sell you a Numax for a little over £30 or an excellent Westco for under £65. There is an Ebay shop selling a FIAMM branded battery (I thought they only made filters) for under £30. Prices for the larger batteries are very similar. If anyone has questions about batteries please ask them here. If you have another question about electrical matters please use the search facility (button at the top of the page, not the one on the right inside the thread) and if your question has not been asked before, please start a new thread. I will ask the mods to keep this thread specifically on topic about batteries. I cannot guarantee to answer all electrical questions. Batteries are something I have knowledge and experience of but I'm not an auto-technician. My background is working on the electronics you find in Xerox products and is a decade out of date, but the laws of physics don't change! This signature is left blank as the poster writes enough pretentious bollocks as it is. Link to comment Share on other sites More sharing options...
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