I use AGM batteries in all my bikes and am very satisfied. Just be careful who you buy it from. I bought one from Bikebatts.com and it failed at about 18 months. When I tried to get it exchanged he tried to sell me a higher price battery. I questioned the warranty and prorated amount and he got mad at me and said any further correspondences will be by email and hung up on me. I did not demand anything and he did not offer a reduction in shipping and did not question my using a battery tender. This is an email from the owner, "First, you did not follow recommended charging instruction. This most likely resulted in premature failure of the battery. None the less I said we would cover the battery under the warranty policy. In addition, I agreed to waive the requirement for you to return the battery. Third, I gave you a reduced rate for warranty shipping. Next, you wanted me to give you 50% credit for a product you did not purchase. Further, you stated the 50% credit for the product you did purchase was not enough. Then you accused me of being unreasonable. Think about what transpired through this conversation. Your dogmatic, unreasonable, insulting attitude left no room for further discussion. Thus, the end to the call.
I treat reasonable people in a reasonable way.
I hope someone else enjoys your business."
I took my business elsewhere.
Try Royal Battery Co., they have a two year warranty on Motobatts.