No but I made an adapter and wired a 3S lipo battery for my RC cars to mine which is 12.6 fully charged and ( 4.2 volts per cell x3 ). Had a lipo buzzer on it and sitting next to me while I worked so I didn't kill my lipo.
It took 8+ hours and 2 lipo's to charge the trail tech up from when I bought it. now that its fully charged and I have used it a couple times to where it charges when my sled runs. its totally fine. I don't see any reason for any other nonsense. I stopped a bunch of times the other day and it really didn't loose any charge.
I'm thinking peoples issue are that it comes dead, deader than dead like dead dead dead. and it takes FOREVER to charge. so if you buy it and hook it to sled and turn sled off it will die pretty much instantly.