Hello. I have a wltoys 144001 for over a year now and I don't know if it's stock ESC is broken or... I've been using the battery pack that came along with it (2s 1500mAh LiPo) but when I use my other 2s LiPo (Turnigy 2200mAh), it keeps cutting off the fully charged battery. I ran it freely/full speed off the ground and it's working fine but when I put it on the ground, it runs for like 5~10 seconds and the battery gets cut-off. I also made a 2s 18650 3400mAh and the same thing happens. I used a multimeter and checked the voltages showing over 8 volts. I used the said batteries on my modified wltoys a959 and it's working fine. Anybody have any ideas?