I like the Bioenno batteries, I think their prices are on the high-end of reasonable, but my 20 amp battery works great.
To size the battery, you need to know how you are going to use the radio and how long you want to use it. For example, let's say the radio uses 3 amps transmitting, 1 amp receiving. A use case of 50% transmitting, 50% receiving would put you at 2 amp/hr usage.*
Now that you know consumption, you need to multiply that average times the number of hours you want to operate between charges. Let's say 7-8 hours - that's a lot of operating between charges. So that points to a 15 amp battery to give you 7-8 hours usage between charges. You could step down to a 12 amp battery if you add a modest solar charger to the mix as Joseph described.
I hope that helps,
Ken, N2VIP
* my power consumption numbers are NOT FT-817/818 numbers, they are made up for simple math.
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On Apr 16, 2019, at 12:50 AM, Joseph Wonoski N1KHB@... [FT817] <FT817@...> wrote:
Personally, for operations where I am not backpacking, I have a 25 w solar panel and a 12v 12A SLAB to power my FT-817, for Field Day like ops.
