Adoepner
Posts: 42
Joined: Mon Jul 01, 2019 10:08 am

Re: Cost to replace an i-miev battery?

Sun Mar 29, 2020 11:03 am

Hi Enginerd,

Who is your supplier for the LG 21700s?

Andrew

datom
Posts: 15
Joined: Wed Apr 11, 2018 8:01 am

Re: Cost to replace an i-miev battery?

Mon Mar 30, 2020 12:24 am

Adoepner wrote:Hi Enginerd,

Who is your supplier for the LG 21700s?

Andrew


Hi,

NKON has them for €4,95. https://www.nkon.nl/de/lg-inr21700-m50-5000mah-7-3a.html

Adoepner
Posts: 42
Joined: Mon Jul 01, 2019 10:08 am

Re: Cost to replace an i-miev battery?

Tue Mar 31, 2020 11:03 am

Do the LG 21700 cells have a high enough current rating? They are rated for 7.3A.

An LEV50N is capable of 300A continuous (https://pushevs.com/2015/11/04/gs-yuasa ... vs-lev50n/). You would need 41+ of those LG cells in parallel to be able to deliver a rated 300A. I don't think there is enough room to replace each LEV50 with 41 21700s. A practical maximum I've seen is in the neighbourhood of 20x21700 per LEV50 using this circle packing calculator (https://www.engineeringtoolbox.com/circ ... _1905.html).

Unless we know with certainty what the maximum current the car will draw under any circumstance, I'd only be comfortable replacing like-for-like as far as battery specs are concerned. Lower amperage cells have a higher internal resistance and heat up more under load (and charge).

Andrew

datom
Posts: 15
Joined: Wed Apr 11, 2018 8:01 am

Re: Cost to replace an i-miev battery?

Mon Apr 20, 2020 11:43 pm

Enginerd wrote:20 x 21700 LG M-50 cells ordered and on their way for initial testing.

....

Enginerd, Did you try the 21700 cells already?


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