Modest capacity but quality battery packs?

saucerful

1 mW
Joined
May 26, 2022
Messages
13
I'm looking for a quality battery pack (preferably including Hailong type enclosure), which my research tells me (correct me if I'm wrong) means brand name (non-Chinese) cells. Unfortunately the only brand name cell packs I can find are more than I want to spend (say $400 max, preferably less). For example eBay is full of 48V * 17.5Ah = 840Wh packs built of Samsung 35E cells but they are $500+. Thing is I'd be happy with as little as 400-500Wh (flexible on voltage). Seems like at $5 for a 3.6 V * 2.5 Ah = 9 Wh 18650 cell, that should be very doable for less than $400. But the marketplace is failing me. Any tips? Do I have to borrow a spot welder and DIY? Thanks!
 
https://lunacycle.com/18650-ebike-battery/

https://em3ev.com/product-category/ebike-battery-parts/ebike-battery-in-case/

#NotAffiliated
 
saucerful said:
Seems like at $5 for a 3.6 V * 2.5 Ah = 9 Wh 18650 cell, that should be very doable for less than $400. Do I have to borrow a spot welder and DIY? Thanks!
Yes, but you probably won't come in under $400.
 
48V with a 13x4 cell array using 2.5AH cells will get you 480WH. From experience, a 10AH pack is a disappointment. Too dinky. Go for 3.5AH cells and you will have 14Ah and 700 KWH. If you used Sanyo 18650GA cells. they will cost $5.45 at 18650batterystore,com

$70 Hailong-1 Case on ebay with BMS and cell holders
$300 Samsung GA cells. 52 shipped from Atlanta
$ 15 8mm x.15 mm pure nickel strips
You borrow the spotwelder, and we're in the $400 ballpark.

Cost you about $500 to buy it from UPP.
https://www.aliexpress.com/item/3256801118137814.html?spm=a2g0o.store_pc_groupList.8148356.37.27ba1848uswcD5&pdp_npi=2%40dis%21USD%21US%20%24563.00%21US%20%24337.80%21%21%21%21%21%400b0a187b16536985162295123e5b77%21%21sh
 
If you're ok not running a hard case BicycleMotorWorks has a 52v 8ah battery with cheap charger for $375, spend a little more and you can get 12ah or 16ah. I bought the 52v 16ah one back in September and have been very happy with it, I spoke with someone who works there with concerns with the quality due to all the bad manufactures and he put my concerns at ease and offered advice with my build which was cool. The battery felt really well build and the heat-shrink they use is very thick and heavy duty feeling. Only problems I had were with the charger, came with a broken barrel to xt-60 adapter so I soldered the xt-60 directly to the charger, now I'm having problems with the fan making a grinding noise when I got to charger but unplugging it a few times makes it go away for that charge.

https://bicyclemotorworks.com/product-category/e-bike-batteries/52v/
 
Thanks docw009 and bengy2022! Those are both nice options. Does anyone happen to know how likely it is that the "Seiko IC BMS" on those UPP batteries will balance before reaching a full charge? I am planning to typically charge to less than full capacity in order to maximize battery life. (Any input on the significance of this feature that I've read about is also welcome.)
 
Bengy22 said:
If you're ok not running a hard case BicycleMotorWorks has a 52v 8ah battery with cheap charger for $375, spend a little more and you can get 12ah or 16ah. I bought the 52v 16ah one back in September and have been very happy with it ... https://bicyclemotorworks.com/product-category/e-bike-batteries/52v/
The 52V 16Ah ($450) uses 40T 21700 cells -- :thumb:

Besides BicycleMotorWorks you may also want to consider BtrPower and Aegis Battery.

This BtrPower 52V 30Ah isn't modest ($550 from Btr), for 30Ah price seems reasonable ...
https://www.btrpower.com/collections/52v-ebike-battery it uses LG polymer soft cells ...
0ca008d2-4272-45a1-8ed0-021e067a271c.__CR0,0,1001,1001_PT0_SX300_V1___.jpg

Scroll down to see more about BtrPOWER: 50A BMS, 5A Charger and LG polymer soft cells ...
https://www.amazon.com/BtrPower-Lithium-Battery-Electric-Bicycle/dp/B07XPSLYDS/ref=asc_df_B07XPSLYDS/?tag=hyprod-20&linkCode=df0&hvadid=385674048452&hvpos=&hvnetw=g&hvrand=8092895456708358640&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9019693&hvtargid=pla-838701607174&psc=1&tag=&ref=&adgrpid=78359258283&hvpone=&hvptwo=&hvadid=385674048452&hvpos=&hvnetw=g&hvrand=8092895456708358640&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9019693&hvtargid=pla-838701607174
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Aegis Battery has a 52V 12Ah for $320 (battery only) ... with 3A Charger $363 ... https://www.aegisbattery.com/collections/52-60v-nmc-li-ion-batteries/products/52v-12ah-li-ion-battery-pvc ... 18650 cells
52v12ahnmcliionaegisbattery_1024x1024.jpg

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BtrPower has a 52V 16Ah for $319 including 30A BMS and 3A Charger ... https://www.btrpower.com/products/ebike-battery-52v-16ah-li-ion-battery-pack-with-3a-charger-30a-bms ... LiFePO4 A123 polymer cells
Productperformance_a47d2d9f-069a-4039-9f00-65d7b0d63dca.jpg
 
saucerful said:
For example eBay is full of 48V * 17.5Ah = 840Wh packs built of Samsung 35E cells but they are $500+. Thing is I'd be happy with as little as 400-500Wh (flexible on voltage).

Look for "Hailong 1" or "Hailong 1.2" cased packs for lower capacity options. The biggies hold more cells, but then you have to buy more cells.

Topbikekit lists a passel of smallish packs using Samsung cells. Their prices are low, but shipping is relatively high. I know nothing about their workmanship standards, but they seem to want to uphold a good reputation which is a positive sign.
 
saucerful said:
Thanks docw009 and bengy2022! Those are both nice options. Does anyone happen to know how likely it is that the "Seiko IC BMS" on those UPP batteries will balance before reaching a full charge? I am planning to typically charge to less than full capacity in order to maximize battery life. (Any input on the significance of this feature that I've read about is also welcome.)

UPP doesn't use balance BMS. I talked to one of their guys on messenger chat and he said balance was special order.
 
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