Timeline for Handling large current peaks on CR2032 battery
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 6, 2023 at 18:10 | comment | added | Letho | I also can see sense in it, but the device might be used outside, so as @TimWescott pointed out, using LiPo might not be ideal. Another thing I would be worried is, I would need to use some charging circuit and/or some step-up converter, as LiPo has 3.2V. After some LDO to put the voltage back down. I'm not sure, if this solution is manufacturable due to lack of chips. Yes, the capacitor I posted is not enough. Maybe solution could be using 2 capacitors CPX3225A752D. They should deliver 100mA each. | |
| Feb 4, 2023 at 18:32 | comment | added | TimWescott | I wouldn't have thought of the rechargeable battery -- but I can see sense in it. This would only work for room-temperature or strapped-on-people devices, though. LiPo cells, like most rechargeables, really don't like excessive hot or cold. | |
| Feb 4, 2023 at 17:05 | comment | added | Spehro 'speff' Pefhany | @ErnestoG TBH, I didn't reverse engineer the circuit, merely re-soldered the fractured battery connection and put it back together. The LiPo battery would be directly feeding the transmitter circuit for sure. | |
| Feb 4, 2023 at 16:57 | comment | added | Designalog | Are these systems normally using some sort of lipo battery charging IC to interface between both batteries, and is the lipo normally feeding the large-current peaking device (no LDO/SMPS in between)? | |
| Feb 4, 2023 at 16:29 | comment | added | Spehro 'speff' Pefhany | @ErnestoG It charges itself from the CR2032, which lasts around a year or two. | |
| Feb 4, 2023 at 16:24 | comment | added | Designalog | How often do you have to charge that rechargeable battery of your keyfob? | |
| Feb 4, 2023 at 15:36 | history | answered | Spehro 'speff' Pefhany | CC BY-SA 4.0 |