2018 - Best weight/safety trade-off.

Hi,

To your knowledge, today, what is the best weight/safety trade-off technology for bicycle batteries equipped with a 250W motor

Safety is my primary concern, but weight is the 2nd most important criterion to keep the bike very light.

Li-ion, or LiFePo4 in prismatic, or what, and which brand to use

Have a Nice Day.

Thierry

To run a bike that low power, you should be able to stand the weight of lifepo4, to get the safety of that chemistry.

As a rule of thumb, any battery under 10 pounds is easy to carry in the WORST place to do it, a rear rack. It just does not weigh enough to greatly affect the handling of the bike.

36v 10 ah should be less than 8 pounds, even in lifepo4. Pingbattery.

dogman dan said:

36v 10 ah should be less than 8 pounds, even in lifepo4. Pingbattery.

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< 4.5lbs in 18650s.

Buk___ said:

dogman dan said:

36v 10 ah should be less than 8 pounds, even in lifepo4. Pingbattery.

Click to expand...

< 4.5lbs in 18650s.

Click to expand...

18650 for Li-Ion or LiFePo4

What cells do you use, Please

Thierry

ThierryGTLTS said:

What cells do you use, Please

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My pack is made from 40 Samsung ICR-18650 26H, which are one the Li-ion chemistry variants, weight 1.98kg, with the bms but no hardcase, giving 36V nominal @ 10.4Ah.

Thanks for those infos.

Thierry

Well, you said safety is important. here is what 18650s made my house look like last spring.

My experience is NOT typical. But just saying, I ran lifepo4 for 5 years and never had the ping battery do this.

By now, a noticeable number of us here at ES have had a fire with the 18650 cells, of one or the other chemistries that were being called "safe as lifepo4"

The hoverboards alone prove that is not exactly true.


If 4 pounds makes that big a difference to you, then choose the 18650's. Waaaay lighter, Waaaay smaller. But I'm saying that if you only need 10 ah, I personally cannot tell much difference carrying 4 pounds, or 8 pounds of battery in the worst place, the rear rack.

Put 15 pounds there, and hell yeah its affecting the bike ride. But 8 does not, IMO.

Keep the lithium manganese out of the house, and it can't burn it down. Simple fix really.
But if you live in apartments, get the ping lifepo4.