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User Panel
User Panel
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Posted: 2/21/2020 12:16:19 AM EDT
[#1]
LIfePO is generally safer and has a better cell voltage that jives better with ham radio equipment. A fully charged cell is around 3.6v. With 4 in series thats 14.4v which is within tolerance of 12v ham equipment. The discharged voltage is 2-2.5v per cell which is 8-10v in a 4 cell series configuration.
LIPO is 4.2v charged which would be 16.8v in 4 series. Discharged 3.0v so 12.0v in series. Just not as good as a compatible range even in a 3 cell series configuration. |
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Posted: 2/21/2020 12:19:44 AM EDT
[#2]
Good write-up here: http://oh8stn.org/blog/2018/05/17/lithium-ion-vs-lifepo4-vs/
Main advantage of LiFePO4 is the 3.3V nominal cell voltage x4 cells gets you to around 14V total when fully charged, which is toward the top end of the desirable range for most radio gear. They also tend to have more charge cycles before cells begin to degrade. Downside compared to Li-ion will mainly be cost. |
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Posted: 2/22/2020 12:57:45 AM EDT
[#3]
Also, typically li-ion will have an 80% capacity for 300-500 with better ones up to 1000 cycles. LiFePO4 generally have 2000-4000 cycle 80% lives. LiFePO4 can be slightly lighter than li-ion mainly due to packaging.
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Posted: 2/22/2020 10:37:44 AM EDT
[#4]
For radios like the FT-817 that can tolerate lower voltages a 3S LiPo can work great and be very cost effective. I used Zippy 5000mah RC batteries and never had any problems with them. They need a little extra care than LiFePo's, but not a big deal.
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Posted: 2/22/2020 12:10:20 PM EDT
[#5]
For ~$20 you can build a 300w dc-dc converter to step a 4S lipo pack down to 13.8. A number of our club members have built them. The boards are all over amazon and you just need to add an enclosure and pigtails.
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Posted: 2/22/2020 1:34:39 PM EDT
[#6]
Quote HistoryQuoted:
Also, typically li-ion will have an 80% capacity for 300-500 with better ones up to 1000 cycles. LiFePO4 generally have 2000-4000 cycle 80% lives. LiFePO4 can be slightly lighter than li-ion mainly due to packaging. |
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Posted: 2/22/2020 5:49:44 PM EDT
[#7]
Quote HistoryQuoted:
For ~$20 you can build a 300w dc-dc converter to step a 4S lipo pack down to 13.8. A number of our club members have built them. The boards are all over amazon and you just need to add an enclosure and pigtails. |
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