Now, digital multimeters are cheap and practical, and I don’t need to elaborate on their benefits. However, there’s one issue that has been bothering me: the high battery consumption. Fortunately, with the development of technology and components, I can now replace that annoying 6F22 battery. Friends with the same problem might as well give it a try.
Materials:
1. Boost board, about 2 yuan each online. 2. Charging protection integrated board, more than 1 yuan each online.
3. Battery: You can use an old lithium-ion battery from a mobile phone (a new battery is of course better, as it lasts longer after a single charge). I believe everyone has one. Make sure it fits in the case and try to choose one with low self-discharge, meaning it should retain its charge for a long time after being fully charged. 4. Several wire ends, 704 silicone, etc.
Circuit:
Modification process: I won’t go into details.
Actual modification effect:
Using an old battery from a mobile phone instead of a new one can last quite a long time after a single charge. The old battery, rated at 600mAH (I estimate it retains at least 300mAH of residual capacity, though I haven’t measured it), can last about two months.
Original text: http://www.jdwx.info/thread-751508-1-1.html
The home appliance repair forum Taobao store sells finished 9V batteries:
Store name: Home Appliance Repair Forum
Buy 9V rechargeable lithium battery (Taobao):
https://item.taobao.com/item.htm?id=566586368597
Copy the link to open in the mobile Taobao app or browser