JCSB:
Am I right about the DW01 not being suited for lipo batteries? thanks!
On its own, then yes, they are not suitable.
Most LiPos are used in devices that have 'proper' low voltage cutoffs, phones, tablets, cameras etc. These devices will, you mave have noticed, warn you that the battery is low and turn off the device in a graceful manner. They do this of course with their own cut-off circuits. A common safe cut-off would be 3.0V, no point in going lower anyway, there is virtually no capacity left in the battery at this voltage.
This leaves battery manufactures with an issue, its well known that LiPos can explode and cause fires, so what to do to protect themselves if an idiot designer produces a wizard device that does not have a 'proper' low voltage cutoff ? So the manufacturers fit last ditch protection devices internal to the batteries as a backstop. They have a very low level cutoff so that they dont interfere with a 'proper' low voltage cutoff and turn off a device before data can be saved. The devices used for these internal battery cut-outs are made in very large quantities and become very cheap.
So hobbyists, who are mainly concerned with doing stuff on the cheap, see these very low cost 'protection' devices coming out of China as all they need to make their own wizard device and battery safe.
Hobbyists are apparently re-assured by the fact that you would not be able to buy these low cost so called 'protection' devices if they were not safe ?