Reddit reviews Ibera Bicycle Triangle Frame Bag, Strap-On Bike Top Tube Pouch, Cycling Essential Saddle Frame Bag with Reflective Trim, Crossbar Bike Pack MTB, Road Bikes (Large: 5L Capacity)

While it doesn't fit my batteries, you might be interested in something like this. I use a large one for my cable lock, U, and repair tools. I"m not sure how large your battery is, though.

Sure, here are some links to the components.

Basic kit: https://smile.amazon.com/gp/product/B00Q8JT9H2
Batteries: https://mahbattery.com/sanyo-ncr20700b-4050mah-15a-battery/
BMS: https://www.aliexpress.com/item/32821764284.html
Triangle Bag: https://smile.amazon.com/gp/product/B006JA8WEG
Cable Glands: https://smile.amazon.com/gp/product/B07KFCGFYF
Torque arm: https://www.ebikes.ca/product-info/torque-arms.html

If you've never built a battery before and don't have the tools I would start with a pre-built pack. Spot welders are expensive and a mistake building a pack could be destructive and life threatening. My pack is a 48v nominal pack (39-54.6v). I'm not sure about using a true 52v pack(42-58.8v), though I'd guess it would be "ok".

This is the cheapest kit+battery combo I could find that should cover your distance @36v 17.6ah - total is around 250 with used, "samsung" batteries. Better quality cells could be had and still be under budget.

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26" rear Hub kit - $120

4x, Used, 36v 4.4ah batteries (17.6ah) - ~$90 (use at your own risk or see second link below)

3x, xt60 battery connectors to connect them in parallel- less than $10.

Triangle Bike bag - $15

charger - 20 bucks

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hub kit - https://www.ebay.com/itm/36V-Rear-Wheel-Electric-Bicycle-Motor-Conversion-hub-Kit-500W-26-Ebike-Cycling/112571729539?hash=item1a35cc4683:g:wK4AAOSwak5Zwyjs

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4x, cheap, used hoverboard batteries (use/charge with caution) - https://www.ebay.com/itm/Samsung-36V-4-4AH-Lithium-Ion-Battery-for-Balancing-Scooter/223153190239?epid=15022071626&hash=item33f4f7755f%3Ag%3AodUAAOSwlOJbY09P&LH_ItemCondition=4

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4x better quality batteries (~180 total) seller claims that these were LG cells from alarmhookup - ask them for details- https://www.ebay.com/itm/36V-4-4AH-Lithium-Ion-battery-pack/132794495527?hash=item1eeb2b3227:g:Sc8AAOSwwB5bqZ4N

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3x xt60 connector to connect 4 batteries in parallel- https://www.ebay.com/itm/XT60-Parallel-Y-Splitter-Silicone-WireConnector-Cable-Dual-Extension-for-DJI-Ph/142880685651?hash=item21445a3e53:g:vOgAAOSw~xVbVdDC

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bike bag - https://www.amazon.com/Ibera-Bicycle-Triangle-Cycling-Mountain/dp/B006JA8WEG/ref=sr_1_3?s=sporting-goods&ie=UTF8&qid=1538659727&sr=1-3&keywords=triangle%2Bbike%2Bbag&th=1&psc=1

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I use a cheap triangle frame bag, which can hold more than just a lock https://www.amazon.com/Ibera-Bicycle-Triangle-Frame-Medium/dp/B006JA8WEG/ref=sr_1_1?ie=UTF8&qid=1522472458&sr=8-1&keywords=ibera%2Bframe%2Bbag&th=1&psc=1

That's my $14.99 Ibera frame bag. I use it for my U-lock and repair kit, and on long rides (200k+) it holds snacks and a battery pack to charge my phone while riding. Best $14.99 I've spent on bike stuff yet!

I have this it fits all my tools (I carry a lot: replacement tube & chain, racheting driver with bits, CO2 inflater with cartridges , patch kit, duct tape, electrical tape, zip-ties, etc.) and doesn't rub my legs at all.

This is the exact same one i ordered off amazon. It is originally supposed to go on the frame, but last minute i noticed it would fit to the bars and i liked it there much better. I had a portable phone charger, knife, wallet, keys, headlamp, ipod, iphone, chapstick, green tea packs, small water-proof camera, travel size advil bottle, and a couple google maps print outs in it. http://www.amazon.com/gp/product/B00D87ECUQ/ref=oh_details_o05_s00_i00?ie=UTF8&psc=1

All of my gear is cheap bags etc off amazon and i have no complaints whatsoever of any of it. Everything also has a few coats of scotch-guard on it, just in case. It down poured in the start of the tour and everything inside stayed dry.

PANNIERS:
http://www.amazon.com/gp/product/B00165Q4RG/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1


I use this cover for my sleeping bag. It's already in a water resistant compression bag, but i don't like to mess around with the sleeping bag. End of the day, it's the one thing i don't want wet.
http://www.amazon.com/gp/product/B00BTHK5U8/ref=oh_details_o04_s00_i00?ie=UTF8&psc=1

FRAME BAG:
http://www.amazon.com/gp/product/B006JA8WEG/ref=oh_details_o03_s00_i00?ie=UTF8&psc=1

BIVY TENT:
http://www.amazon.com/gp/product/B0056SOA48/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

I bought a large Ibera Triangle Bag for my bike, you will have to cut holes where you want the wires to enter/exit, the ebike guts live in the big compartment, and I store a lock/various maintenance tools in the smaller sip pocket: https://www.amazon.com/gp/product/B006JA8WEG/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1