I got the Shanling M1 in a previous drop, and within about 6 months, the battery exploded. Massdrop support pointed me at Shanling, and Shanling support was completely unresponsive after three attempts to contact them. So if you do get in on this, be aware that you may be left on your own if something goes wrong.
Photos of the ruptured battery on my M1 (swelling was so bad it broke through the back cover. Zero damage to the rest of the unit, so it wasn't dropped, crushed, or anything like that. https://imgur.com/a/NKBfgis
Shanling-FrankieI e-mailed info@shanling.com (the address listed on the Shanling web site). I tried contacting Shanling first on 1-Dec-2017. After receiving no reply for a few days, I contacted Massdrop support on 4-Dec-2017, who said it was out of their warranty period and would need to be addressed with the manufacturer. I contacted Shanling via e-mail again on 4-Dec-2017 and 7-Dec-2017 and received no response to either correspondence.
flarpMain email can sometimes be tricky(hosted on chinese server, Gmail and other sometimes refuses to send there emails). Please email alternative email listed on Shanling website.
flarpThe alternate address worked. I appreciate your reply, but at this point, I'm going just cut my losses on this one. It isn't worth it to me to pay another $50 to repair the broken player. Thanks.
flarpThe same thing just happened to me with a Shanling M2s that I got through Massdrop last July. I took it on a flight last week and the battery swelled enough to pop the back off. The unit continued to play, but it is unusable now.
What email address did you use to successfully contact them?
flarpIf you're interested in fixing your M1, Shenzhen Audio is the agent Shanling uses to provide replacement batteries:
https://www.shenzhenaudio.com/shanling-m1-accessories-wheel-screen-bettery-for-m1-hifi-portable-mp3-player.html
I got 2 replacement batteries for my M2s for $25 (free shipping). They take a while to get here from China (ordered on May 14th, delivered on June 8th) but I now have a working player again, with a spare battery to boot. Batteries even come with the double sided tape attached for sticking the to the back panel of the player.
Photos of the ruptured battery on my M1 (swelling was so bad it broke through the back cover. Zero damage to the rest of the unit, so it wasn't dropped, crushed, or anything like that. https://imgur.com/a/NKBfgis