In reply to M6CSS:
I also use an FT-857 as do many other activators so there is a lot of information on using them on batteries on the reflector. If you search, I’m sure you’ll find all the old threads.
- SLA. Heavy but you may already have one. Voltage droops in use limiting energy recovery.
- NiMH. I use 11 cell packs which give just the right voltage.
- LiFePO4. More expensive but very light and forgiving. Ideal voltage.
- LiPo. 3S pack is a bit marginal (low V). 4S is a bit high. Common practice is to use the Vf of a diode to lose some voltage from a charged 4S pack.
If you have Edition 10 of the RSGB Handbook, I’ve put quite a lot of info on batteries in there.
50W SSB for 30 mins needs about 2ah. That’s all.
GL. I hope you get as much enjoyment from SOTA as I have. Work you soon. Your name?