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519fpvSample@519fpv ·
#21700 power-pack challenge#FPV drones#21700#UF20B
6S2P 21700 long-range pack, my entry for the #21700 power-pack challenge
You only find out how many pitfalls there are once you build your own FPV drone packs: the negative side of tabless 21700s is really current-hungry — I had to push the UF20B to gear 52 to get full penetration. Paired it with a 40A BMS and measured every cell's internal resistance before welding; max spread 2mΩ. Flew three packs, and the shell wasn't hot when I touched it after landing. Happy. The recipe is attached to the project. Judges, please go easy on me.
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Ep. 30 | One video teaches you how to build a 21700 pack — never worry about long-range battery againProjects519fpv
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Comments (10)

MePost
普
普通的少年1 · 1 yr ago

Internal-resistance meter, spot welder, and you need to be handy too, otherwise... Coolapk DIY battery.jpg

12Reply
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十
十月八 · 1 yr ago

Last time charging at school, had the mode set wrong, it blew up straight away, whole-school notice. I'm out, I'm out

8Reply
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凡
凡尔赛 · 1 yr ago

72V 120Ah pack (liked by the creator)

5Reply
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来
来一箱哒不溜 · 1 yr ago

I've already pierced two cells

2Reply
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霜
霜序初六·听南ˇ · 1 yr ago

2170s, I paid 40 a cell

2Reply
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越
越久越习惯*飞 · 1 yr ago

Only a fool goes to this trouble, a few yuan sorts it

1Reply
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青
青山依旧在 · 1 yr ago

How do you activate lithium cells

LikeReply
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迷
迷途 · 1 yr ago

Is the discharge C rating of 21700s enough

LikeReply
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白
白云间 · 1 yr ago

Pretty practical

LikeReply
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无
无人机打药 · 1 yr ago

Buy a retired crop-sprayer drone battery and make a pack, it's better than DIY. ¥500 stores 0.95 kWh, supports super fast charging, full in 20 minutes, 20C discharge

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