UselessPickles
Active Member
I received my AA-sized Li-ion cells and some battery holders with leads for testing. I soldered the AA battery holder leads to Dayton Audio LBB3v2 board while leaving the original 18650 size battery holders in place. This is just temporary for testing purposes.
These are 1100 mAh Orbtronic cells; the highest legit capacity cells I could find (there's plenty of fraudulent listings for various lower capacity cells claiming to be much higher 2500 mAh, etc.).
I'm definitely getting my money's worth out of the RJ45 breakout board I bought when first starting this project. This time I used it to provide power from the battery module directly to my Bluetooth adapter prototype, and also measure amp draw:
Here's some results (this is total amp draw of my circuit AND the car phone handset:
Assuming that about 90% of the Li-ion battery capacity with be practically "usable" (not sure if that's a good assumption or not), I should expect to see:
It's not a fair comparison, because I'm not powering a 3-watt 1G cellular radio, but here's the claimed specs from the original car phone user manual with its 1400 mAh NiCad battery pack:
And just for fun, a side-by-side comparison of different battery cells:
These are 1100 mAh Orbtronic cells; the highest legit capacity cells I could find (there's plenty of fraudulent listings for various lower capacity cells claiming to be much higher 2500 mAh, etc.).
I'm definitely getting my money's worth out of the RJ45 breakout board I bought when first starting this project. This time I used it to provide power from the battery module directly to my Bluetooth adapter prototype, and also measure amp draw:
Here's some results (this is total amp draw of my circuit AND the car phone handset:
- Idle, with handset backlight off, but with an active BT connection:
- 55 mA
- In a call, audio to ear speaker, music playing from the other end of the call, max volume:
- ~170 mA average
- In a call, audio to loudspeaker, music playing from the other end of the call, max volume:
- ~215 mA average (I saw a peak of 225 mAh at a loud part of the song)
Assuming that about 90% of the Li-ion battery capacity with be practically "usable" (not sure if that's a good assumption or not), I should expect to see:
- About 18 hours of "standby" (idle) time.
- About 5.8 hours of "talk time" on the handset.
- About 4.6 hours of "talk time" on speakerphone (although, you typically wouldn't have a an external mic handy for speakerphone use when carrying the phone around on battery power).
It's not a fair comparison, because I'm not powering a 3-watt 1G cellular radio, but here's the claimed specs from the original car phone user manual with its 1400 mAh NiCad battery pack:
- About 16 hours "standby" time.
- About 80 minutes "talk time" with the transceiver set to "low power" (probably only usable if you were in an area with strong signal).
- About 50 minutes "talk time" with the transceiver set to "high power".
And just for fun, a side-by-side comparison of different battery cells:
- Left: 10x "A" size 1.2V 1400 mAh NiCad cells used in the car phone's original battery pack.
- Top Right: 3x "18650" size 3.7V 3500 mAh Li-ion cells that I bought for use with my Dayton Audio battery module, but they are too big for my project.
- Bottom Right: 3x "14500" size ("AA") 3.7V 1100 mAh Li-ion cells that I'll be using.
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