After lots of fruitless searching and contacting Sena, I came to the conclusion that buying a replacement rechargeable battery for my SMH10 was going to be impossible. So I took it upon myself to do something about it. I have sourced a number of replacement Lithium batteries and am offering them for sale to Netriders at a discount to what I am charging on eBay and other sites. Since it was the same outrageous price to ship 1 battery from the supplier as it was to import up to 100, I bought a "few" extras (not 100 tho!). These batteries are already fitted with suitable plugs, and are the same model and specifications as the original battery. I've tested the new battery and found it to typically give around 14 hours of music. I was unable to test the intercom to flat b/c no one will talk to me that long! However, I ran a mixed test and found it gave 5hrs, 6mins intercom, then a further 6.5hrs music. I am selling these as a kit. The kit includes: 1x battery 1x Torx T7 driver (to remove the screws) Some double sided tape to reattach the battery Instructions A little silicon grease to help seal the sealing ring (can't guarantee watertightness, but this should help). As a kit, they're $45 to Netriders, postage included. I can only post within Australia at this stage, due to restrictions on sending Lithium batteries by air (which I'm trying to resolve). Note that if your SMH10 is still under warranty, it would be better to see if your retailer can find a solution within the warranty conditions. However, I've found that SENA can't help if you're out of warranty, so if your battery is dying, this might be a better option than buying a whole new unit. If anyone would like one, send me a PM please.