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52V 17.5Ah Li-ion Bag Battery (No BMS)

3,986 views · Published 8 November 2018 · 3:03 · Indexed 28 September 2026

Channel: Damian Rene · 2018 · Science & Technology

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*WARNING: Just a single 18650 cell has the potential to start a fire in your home / workplace. Building a battery is a very dangerous task that should only be done by an expert in electricity and electronics.*
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In this video I show the process to make a 52V 17.5Ah 14s5p (70 cells) raw battery (No BMS) to fit to the maximum a standard small front frame bike bag perfect for small batteries.

This battery consist in a 14s5p Li-ion 18650 3.5Ah cells (Sanyo GA) designed in a way that makes a perfect worth of the volume available inside this bag, requiring a special design to make it the right shape.

* Important observation: The battery build in this video only include balancing circuits and balancing plugs, don't include the electronic protection circuit (BMS) essential for any lithium battery to work correct, reliable and safe. A BMS Unit or a balancing plug to monitor the series must be mandatory integrated.

With Sanyo GA cells It has an awesome energy of 900Wh and a raw maximum discharge current of 50A continuously (2500W) with 100A peaks (5000W). Recommendable average discharge current for lifecycle is 15A (1C)

Basic specifications are:
- 14s5p 52V 17.5Ah Sanyo GA cells
- Dimensions (max): 140mm x 160mm x 70mm
- Weight: 3.5Kg // Volume: 1.5L
- Energy density: 640Wh/L // Specific Energy: 245Wh/Kg

*info:

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Music: David Cutter Music - Corners
#52V #18650cells #battery #build #SanyoGA #spotwelding #custombattery #ebike #electricbike #1kWh #lithium #diy #evmadrid

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