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Tornado H920+ Battery question

Joined
May 12, 2020
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Palm Coast, FL US
Good morning, so I've had my H920+ w CGO4 for about a month now and after a few modifications it's a pretty decent rig. Definitely never was worth the original MSRP tag of $6k+ but there are a few sellers on eBay right now liquidating the last of them for around $2k which is about an accurate value. Couple things to those considering this rig however... The stock antenna system is a joke. I live in a suburban neighborhood with a fair amount of RF noise but not overwhelming and I was barely getting 1500 feet before losing all 3 signals (2.4 RC link, 2.4 telemetry link and 5.8 video link). I ordered the Itelite DBS system for the transmitter (@$100) and relocated the 2 2.4 antennas on the aircraft and actually just reused the 2 antennas from the transmitter for external mounting (see pic) and I've managed to triple my original range, so problem 1 solved. Problem 2 is the battery situation. I'm curious if my fellow H920 owners have had this issue: I charge all 3 Yuneec 4000mAh 6s packs, check all individual cells voltage, everything looks good but after only 3-5 min of flight I begin getting the red low voltage warnings on the radio? I realize the stock batteries only have an 8c rating so they will have a pretty harsh voltage drop under an acceleration load so I usually ignore the warning and just watch my time in the air, but it gets annoying constantly getting the red warning so I decided to try some different lipos with a higher C rating. It was very difficult to find some that fit. I finally came up with 2 SMC 6s 5000mAh 90c packs (3 won't fit). They were hard shell packs and I had to crack them open to fit (see pic). I just made a 1 piece brick. What other packs have you guys tried?
 

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Joined
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....Here is the original hard case and package from the SMC batteries. I actually found them at my local hobby shop (High-Fly Hobbies in Daytona Beach, FL). For 2 of them they were about the same price as the 2 pack of Yuneec batteries. I tried them last night. I flew for 22 minutes with no warnings of low voltage! I brought it in and the batteries took just over 3000 mAh to recharge so technically at 22 min, I only used a little over 60% of their capacity! Excellent results IMO. I def recommend these.
 

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....Here is the original hard case and package from the SMC batteries. I actually found them at my local hobby shop (High-Fly Hobbies in Daytona Beach, FL). For 2 of them they were about the same price as the 2 pack of Yuneec batteries. I tried them last night. I flew for 22 minutes with no warnings of low voltage! I brought it in and the batteries took just over 3000 mAh to recharge so technically at 22 min, I only used a little over 60% of their capacity! Excellent results IMO. I def recommend these.
I’m using batteries nano-tech 4000mah 25-50c having about 20min depends on weather conditions but just few days aggo I found sls german company makes them, they are perfect mach in a drones bay 5000mah 20c , now looking same sls just 5800mah they should fit to, but the weight limit.... it’s weight 790g each, 80g overload. Btw 20c sls 5000mah just 20min flight time. Love to hear more about signal amplifier modificatios. I need them to distance is a joke im getting, adding pictures, just to show off lol got lucky with that.... Double check please "sls" battery sizes, because i might have mistake because of bad given measurements
 

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