https://www.alx-ebike.com/blog-index.html Working out which empty e-bike battery housing fits a pack: cell counts, series and parallel configurations, internal dimensions and BMS clearance. en Sun, 20 Sep 2026 03:07:59 +0000 https://www.alx-ebike.com/blog/how-many-cells-fit-in-a-hailong-case.html https://www.alx-ebike.com/blog/how-many-cells-fit-in-a-hailong-case.html Hailong cases hold 52 to 117 cells on 18650 or 30 to 80 on 21700. Why the listed figure is usually the 18650 one, and what to check instead. Sun, 20 Sep 2026 03:07:59 +0000 https://www.alx-ebike.com/blog/why-13s5p-pack-will-not-fit.html https://www.alx-ebike.com/blog/why-13s5p-pack-will-not-fit.html A 13S BMS is longer than the 10S one most battery case moulds were designed around. The four interior dimensions to ask for, and the cheap fix. Sun, 20 Sep 2026 03:07:59 +0000 https://www.alx-ebike.com/blog/battery-case-internal-dimensions.html https://www.alx-ebike.com/blog/battery-case-internal-dimensions.html The four numbers that decide whether an empty e-bike battery housing fits your pack, why factories do not publish them, and how to read a supplier's reply. Sun, 20 Sep 2026 03:07:59 +0000 https://www.alx-ebike.com/blog/13s4p-13s5p-13s6p-how-many-cells.html https://www.alx-ebike.com/blog/13s4p-13s5p-13s6p-how-many-cells.html 13S4P is 52 cells, 13S5P is 65, 13S6P is 78. How the parallel count decides which battery housings will take your 48 V pack. Sun, 20 Sep 2026 03:07:59 +0000 https://www.alx-ebike.com/blog/how-to-measure-your-frame-for-a-battery-case.html https://www.alx-ebike.com/blog/how-to-measure-your-frame-for-a-battery-case.html The five measurements that decide whether a housing fits, taken off your own bike: mounting spacing, clear down-tube length, clearance, and the pack length to allow for. Sun, 20 Sep 2026 03:07:59 +0000 https://www.alx-ebike.com/blog/how-far-will-a-battery-pack-take-you.html https://www.alx-ebike.com/blog/how-far-will-a-battery-pack-take-you.html Watt-hours for each common pack configuration and what that means in kilometres at low, medium and high assist. Sun, 20 Sep 2026 03:07:59 +0000 https://www.alx-ebike.com/blog/how-to-read-a-battery-case-drawing.html https://www.alx-ebike.com/blog/how-to-read-a-battery-case-drawing.html Which dimension decides the fit, why the opening is shorter than the body, what the tolerance covers, and what the section view says about the BMS. Sun, 20 Sep 2026 03:07:59 +0000