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I have used 2 e-matches in parallel on both the SL100 and SLCF, but using a 1S 350mAh 25C LiPo. I did this to both the SLCF and SL100 roughly 8 times on each altimeter, between actual flights and bench testing. I still use those altimeters and I never experienced a failure due to the choices of LiPo or parallel. According to the logs in the altimeters the current draw was typically somewhere around 5 amps when using dual e-matches in parallel.
Having said that at this stage I use single e-matches but dual altimeters. I also switched from a 1S to a 2S just to give me a bit more margin on the voltage. Two other changes I made to my battery choice were to lower the mAh from 350 to 250 and the C rating from 25 to 20. This gives me a better margin of protection for max current draw which works out to roughly 5 Amps, give or take.
To calculate your max current divide your mAh by 1000 and multiply by the C rating. So a 250 mAh is 250/1000 = .25x20=5Amps
Thanks for sharing your experience. The new lipos are 180mah, 25C, so that puts me at 4.5 amps. question though: in all the specs I see two C numbers - in this case 25 /40. Does this factor in at all?