# DIY Bike Light Battery Replacement Journey How I revived decade-old bike lights with basic tools and community help - **Source:** [Julia Evans](https://jvns.ca) - **Published:** 2026-09-27 - **Topic:** [Career Growth](https://brifing.si/c/growth) - **Original article:** - **On Brifing:** https://brifing.si/s/11fde2e7-7839-471c-afbb-8d134de2ef19 ## Reviving old electronics The author discovered their 10-year-old rechargeable bike lights held only 5 minutes of charge. Despite limited electronics knowledge, they saw this as an opportunity to learn battery replacement skills. The project began at a local queer makerspace, emphasizing community learning over technical expertise. This approach highlights how shared spaces lower barriers to technical repairs. ## Disassembly challenges Opening the silicone casing required cutting along faint seams, resulting in messy but successful access to the circuit board. The author strategically minimized screw removal to avoid reassembly complications, storing them carefully. This phase demonstrated the trial-and-error nature of first-time repairs, where preservation of original components takes priority over perfect technique. ## Battery identification puzzle Faced with a partially legible battery code (LI???77), the author reluctantly used an LLM after traditional research methods failed. The suggested LIR2477 model matched visually, though sourcing proved difficult. A community member introduced DigiKey's search tool, showcasing alternative research methods despite inventory limitations. This step revealed gaps in public knowledge about component identification. ## Parts procurement strategy The author ordered two LIR2477 batteries ($3 each) and silicone glue ($8) from AliExpress, accounting for both bike lights needing repair. The two-week delivery window created natural breaks in the project timeline. Budget-conscious choices reflected the project's experimental nature, where minimal investment justified the learning opportunity over buying new lights. ## Soldering first attempt Following iFixit's guide and peer advice, the author used a desoldering pump with cooling breaks to prevent battery overheating. Initial confusion about welded battery attachments resolved when learning replacements include these components. The process took considerable time due to novice soldering skills, emphasizing the value of communal workspaces for technical guidance. ## Reassembly compromises Small screw losses forced creative reassembly with fewer fasteners, while silicone glue provided imperfect casing closure. The 24-hour curing period and need for a new Mini USB cable delayed full functionality testing. These practical compromises highlight how first repairs prioritize function over aesthetics, with durability remaining an open question. ## Cost-benefit analysis At $20 CAD total (including unnecessary glue), the project delivered working lights and valuable skills. Compared to new light purchases, the financial savings were modest but educational returns high. The author notes proper battery recycling, adding environmental value. This cost structure makes such repairs attractive for curious beginners despite uncertain longevity. ## Community learning value The success underscores how makerspaces democratize repair skills, transforming intimidating projects into achievable challenges. Peer support compensated for technical gaps, from soldering advice to component research methods. Such spaces prove particularly valuable for marginalized communities seeking technical empowerment outside traditional education pathways. ## Sources covering this story - https://jvns.ca/blog/2026/09/27/replacing-the-old-battery-on-rechargeable-bike-lights/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._