Boy, that post is as scary as the poster's hat.
The fact is, LiPoly, like all technologies, is getting better all the time and the MultiStars are a good example. For builds were a constant discharge rate is 35 Amps or less, they are the way to go. They trade discharge rate(and volatility) for compactness and lighter weight for the size and, best of all, they it is available in large bricks of 10, 15 and 20 Ah's.
The days of many sm. bricks strung together w/ a "rat's nest" of wires to make packs that need to be "broken" to charged is done.
The O.P. expressed a desire to use a triangle frame bag and this is how my LiPoly fits in such a bag;
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In this case, 4 bricks of M.S., 6S/10Ah configured in 2S/2P for 20 Ah's of 12S (46V nom.) for an on sale price of $50 a brick. So, $250 (w/ shipping) for a stout(low sag) LiPoly pack w/ a 40 plus mile range. What chemistry comes close to that? Answer, none.
Without the controllers inside the bag, a 30 Ah pack could be easily fitted.
The controllers use a LVC of 42 Volts(as most 48 V controllers do), which leaves the cells at 3.65 V, perfect. So no troublesome BMS is needed for discharging. Bulk charging is handled by the $100 high-quality, Mean Well HLG series LED power supply. Here charging a 12S/5Ah pack;
To check and balance the cells(rarely needed), one Battery Medic per/ brick is used, 2 for above and since the main pack has a low brick count, only 4 for it.
No, LiPoly is not for everybody, it requires some extra time and precautions, but it is NOT a bomb waiting to explode.
And the chance of getting a "dud" brick of Turnigy Lipoly is very small. There are lot's of posts of MultiStar usage and one would be hard-pressed to find user who received a bad brick.
Probably the single biggest time consumer is the fact that it has to be charged two times. The first to storage Voltage of 3.80 to 3.90V. And the second time to top charge voltage. But the fact is, my pack is so big, I can go @ 3.90V for most rides and have capacity left over.
Range anxiety? What's that?