/diy/ - Do It Yourself

>>1530555
>Just so we’re all clear, a 6S2P battery will have an internal protection circuit so they don’t back charge and drain themselves or explode if one cell goes bad

Wrong. Some might do, especially if we're talking about a consumer product like a big USB power bank, but something like a bare 6S2P hobby LiPo pack will literally just be 12 cells & some wires. Picrelated is a Multistar 6S2P under the green heatshrink, notice the lack of any sort of protection circuit.

>But you skipped the couple hours it would take to make a basic battery control circuit. (The idiots on /arduino/ could do it). You fly it a few times and it’s wonderful. But the 12th time in the air, one of the 42 cells on board has a minor fault and the battery catches fire midair, destroying your whole project before it crashes uncontrollably.

You make it sound as though this is a likely scenario. Do you think people that fly $100k+ Alta rigs with cinema cameras have individual cell monitoring & the ability to failover to different packs if one looks like it's going to fail? No, they just strap two big 6S2P packs to the bottom, connect nothing to the quad except the XT90s & fly. Because the likelihood of a spontaneous cell failure like you describe, for a battery that has been properly treated & had its IRs checked regularly, is slim to none. The amount you're blowing this out of proportion is very entertaining.

>>1530562
Don't treat plywood as if it's carbon fibre, because it's not. You don't want to just copy a carbon fibre design & expect it to work well in plywood. In other words, don't make what's in that picture.