Indonesia's e-bike shops are building their own batteries

Perceived Quality: Local Shops vs Chinese Packs

• Some argue local Indonesian pack builders, working under their own storefront “brands,” may be more motivated to maintain quality than anonymous low-end Chinese imports.
• Others counter that a “guy in a shop” is the very definition of no-name, no-QC manufacturing and that wiring and workspace photos look risky by rich-country standards.
• Several note China also produces world‑class cells (BYD, CATL, EVE); problems often come from cheap packs, bad integration, or misused cells rather than cell origin alone.

Fire Risk and Incident Rates

• Thread cites e‑bike fires in China and NYC; one calculation suggests NYC’s apparent incident rate might be higher than China’s, but data quality (bike counts, definitions) is questioned.
• Multiple anecdotes of exploding/igniting packs (e‑bikes, laptops, hobby LiPos) reinforce that failures can be violent and fast.
• Some say DIY or small-shop packs “regularly” burn buildings; others respond that media bias makes rare events seem common and that factory packs also fail.

Chemistry, Cells, and Construction

• Most Indonesian packs shown are 18650 Li‑ion cells spot‑welded into series/parallel configurations, not soft LiPo pouches.
• There is debate over whether cheaper cells are inherently worse vs. merely mis-specified or misused.
• LiFePO4 is mentioned as safer but heavier and trickier for state‑of‑charge estimation, making it less attractive for bikes.

Battery Management Systems (BMS)

• Editor confirms packs do include a BMS.
• Discussion clarifies BMS roles: cell monitoring, balancing, protection (over/under‑voltage, overcurrent, over‑temp), sometimes contactor control.
• Disagreement over how “smart” typical BMS units are and whether using a BMS at all indicates amateur vs. professional design.
• Some note manufacturers lock down BMSs to block cell replacement, complicating repair.

DIY vs Professionalism and Safety Culture

• One camp: assembling packs is “just soldering/spot‑welding,” learnable via videos, and overblown as a hazard; right‑to‑repair and cost pressures justify it.
• Opposing camp: lithium packs are “firebombs”; expertise, testing, and proper facilities (ventilation, fire suppression, separation from dwellings) are essential, especially in apartments.
• Broader tension between Western safety expectations and Southeast Asian economic realities surfaces; cheaper, local solutions may be prioritized over top-tier safety.

Standardization and Market Structure

• Some wish for standardized, swappable e‑bike packs (similar to Taiwan’s scooter systems) to improve safety, interoperability, and economics.
• Others note existing cottage industries and expect more such rebuilders as global e‑bike packs age, but labor costs may limit this in richer countries.