Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
+ Reasonable price (but could be cheaper).
+ Fits 18650 batteries perfectly.
- Could be cheaper.
- The cutoff voltage is 2.75 V, not 3.7 V.
- Requires soldering skills.
- After connecting to the battery this battery gives 0 volts, to make it work put battery into the charger for 20-40 seconds.
- Protected battery becomes longer - be sure that it will fit your device.
The best way to connect this PCB to the battery is a Spot welding. But not every DIYer has it but almost every DIYer has a soldering iron. Soldering is considered dangerous for Li-Ion cells because of overheating. So you have to solder fast and use an active flux (I use aspirin).
If you have unprotected Li-Ion batteries I recommend you to protect them.
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