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Idiot_Savant_Tinker t1_ivg5qd7 wrote

Reply to comment by Grimij in Honda Electric Moped Coming - Step-through electric likely to be announced this year. by speckz

I messed around with motorized bikes using ICE engines back in the late 2000's, always wanted to do an electric one... but the prices of batteries and speed controls always put it out of sight. Are batteries that much cheaper now?

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Priff t1_ivgnpk5 wrote

Batteries are definitely cheaper now.

But also, you can scavenge a lot of the parts from stuff like broken electric scooters. They go for practically nothing on Facebook marketplace.

I'm considering buying a couple and putting the parts from them into a power wheels toy car. For the lulz.

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Idiot_Savant_Tinker t1_ivgtqvi wrote

I have a big brushless DC motor from an electric lawnmower that is begging to be put on something. I've got the controller figured out, but then I look online and see people building these battery packs by spot welding tons of cells together that they've taken out of discarded laptops or whatever, and I just lose motivation.

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Priff t1_ivgv3vj wrote

You can take a battery pack from one of those kickbike scooters, they're usually 40v.

Another option is ordering a battery pack, lifepo packs come in loads of sizes with built in bms and everything pretty cheap.

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RaydelRay t1_ivh7oe5 wrote

How well would 2 Dewalt 60v 6Ah work? $200 for 2 on sale.

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[deleted] t1_ivhe4vu wrote

[deleted]

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i7-4790Que t1_ivizsyl wrote

Can get 180Wh worth of Dewalt batteries (+ charger) for under $100 right now at Home Depot with Holiday promos. The 6 Ah XR in that bundle would have a far superior Samsung 30T 21700. 10 per pack. 5S2P config.

There's also value in utility. Especially if you are invested into a decent power tool platform. (Milwaukee, Dewalt, Makita) Your money goes further if you have a bunch of devices that can share the same battery. I run as much stuff as I can off 5.0 Ah Makita packs I basically paid no more than $7/Ah on. (Buy sales, batteries get super cheap)

Wouldn't exactly call used Eve cells that you might have to rebuild sooner rather than later a good value long term. They have a paltry 7.65A rated cell with comparatively low capacity, probably closer to 2-2.2 Ah since its a refurb/used 18650 from a 3rd rate manufacturer.

Samsung 30Ts blow that Eve crap out of the water. 35A cell, up to 70A @ 18V in 5S2P.

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Idiot_Savant_Tinker t1_ivhespj wrote

Where I live there's some company like bird or lime that has a bunch of scooters. Sometimes I see them broken and thrown in the ditch, maybe they have a battery I can use...

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_Rand_ t1_ivi5jbv wrote

There is a guy around here who drives a ICE bike around, its pretty neat actually.

There is also a kid who drives an electric lawn chair around.

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