WestCo 12V20P Factory Activated Maintenance-Free Rechargeable Sealed Lead-Acid Battery by MK Battery

I’ve owned two of these WestCo 12V20P batteries for my 2004 R1150 GS, and I heartily endorse them for this application. They are exactly the right size and post configuration. The case is sturdy and I’ve never had any corrosion issues. They cost less than half what a BMW battery does from the dealership. I also appreciate MK Battery’s prompt shipping and customer support. They bent over backwards to get me a replacement at the end of my warranty.

I have used this battery on the same bike, that I had purchased it for in the past and feel that it is worth the money. Some years I was a kind and thoughtful owner who properly stored and tended to his motorcycle, other years it slept outside in the elements(located in costal Maine... Snow, rain, heavy salt in the air off the ocean, terrible freeze thaw, and other unpleasantness) The previous WestCo battery lasted about 10 years I am hoping to have the same luck with this one. I will say that when the other died it was a very fast process.

I needed a BMW motorcycle replacement battery, I ordered this one & after arrival it sat for a couple months in the unopened box, I installed it only to find it would not act as a normal battery would, my voltmeter said 12.7 yet it would not crank the motor & it made the tach & speedo needles climb when key was on. A quick call to my mechanic friend & he confirmed when he has seen these symptoms the battery is defective, with a fella en route to purchase this bike and my farm being several hours from replacing it, it became a big deal. The manufacture has told me they will refund my order....that has yet to happen....i will give a sitrep when more is known..but beware.

Perfect, prompt shipping

came quickly, fit my motorcycle, but was slightly shorter so the hold down strap was loose. We'll see how long it lasts.

The negative terminal had considerable corrosion. The positive terminal had a bit of corrosion. I cleaned both before installing. I guess I’ll find out how long it lasts before declaring myself unsatisfied, but I’ve purchased several Westport batteries in the past. None of them looked like they’d been sitting around for a couple years.

Great value for the price.This is my third Westo battery for my BMW R1150GS and they typically last 5 years.I keep it on a smart charger during the winter.

I only just installed this battery. So, I can't comment on how long it will last. My last battery was a Lithium Ion that I expected to last me (4) or (5) years. It lasted (7) months. I had not tried this battery before. I should have noticed that it does NOT have screw down posts. It has upright posts with a hole through it. They give you a couple small bolts with nuts. I spent 30 aggravating minutes trying to install this battery. I had to bend the contacts on the end of my wires. It didn't leave much room to thread a nut. Of course I dropped a nut. I completely vanished. If that wasn't all thrilling enough, consider that when you go to make the second contact point you are working on a FULLY CHARGED battery. The extra 30 bucks I would have spent on a battery with screw-down posts would have been worth it. I'm being kind with (4) stars as I'm holding out hope that this battery will, at least, last me a couple years or more. If it doesn't, I'll be back to update this with what I'm feeling right now: (2) stars.