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Those alarm is not precise. I got a few cheap one from HK, they alarm my 7.4V lipo battery when each cells is 4.00 V , confirm by testing them with my Multimeter.
I almost blew my face up with 11.1 V with those alarm, it won't just alarm last time and my 11.1 V is gone up to 2.8 V and it's freaking hot.
The best way is to count your BBs or get trigger master.
KND
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