21700 downtube case options

Batteries, Chargers, and Battery Management Systems.
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Vw2bugyou   1 mW

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Location: Oregon

21700 downtube case options

Post by Vw2bugyou » Jan 15 2021 1:40pm

I'm building a ( 20s3p ) 72v li-ion pack with 21700 cells. I'd like to use a downtube case. Some listings note that 18650 or 21700 can be used but those give a max capacity of 52 or 54 21700s. Some cases are built 95mm wide specifically for the bigger cells but those don't have a big enough count either.
Has anyone tried to fit 21700s in a polly dp9 case or a hailong max or jumbo shark?
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Seiska   1 µW

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Re: 21700 downtube case options

Post by Seiska » Jan 18 2021 1:51am

I ordered case and waiting for arrival. Will let you know how its goes.
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Vw2bugyou   1 mW

1 mW
Posts: 13
Joined: Dec 03 2020 11:02am
Location: Oregon

Re: 21700 downtube case options

Post by Vw2bugyou » Jan 21 2021 4:03pm

I don't think I've ever been more anxious for someone I've never met to receive their package. Thanks!
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tmho   1 kW

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Joined: Jan 09 2011 3:25pm
Location: Richmond, BC, Canada

Re: 21700 downtube case options

Post by tmho » Jan 22 2021 1:51am

I am also planning to build my next battery pack with 21700 and downtube case. Besides the case, please also share your experience in reliable 21700 sources.
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Jatem   100 mW

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Joined: Jun 03 2019 3:08pm

Re: 21700 downtube case options

Post by Jatem » Jun 02 2021 12:10am

Did you find a polly style case that fits more then 52 x 21700 cells? I'd like to build a 13s5p pack.
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raggertje   10 mW

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Location: Utrecht, The Netherlands

Re: 21700 downtube case options

Post by raggertje » Dec 07 2021 1:54pm

Has anyone succeeded building his 21700 pack in some kind of downtube case?

I'm looking for a case for my 16S4P battery build :D
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rolocretaw   10 mW

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Re: 21700 downtube case options

Post by rolocretaw » Jan 21 2022 12:40pm

Wanting to know the same...
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Tomblarom   10 W

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Joined: Jul 20 2018 1:33pm

Re: 21700 downtube case options

Post by Tomblarom » Jan 21 2022 7:03pm

Guys, check the Reention DP-7: 70cells, 21700, without controller in baseplate (DP-xxC version)

10S7P (0), 13S5P (5), 14S5P (0), 16S4P (6), 20S3P (10)

There are no product images yet, therefore they used the DP-5C images. I just placed an order for 6 cases as well😅 You can also order directly from Reention.

Reention confirmed this case:
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