Nokia N8 BL-4D Battery Replacement Guide

The Nokia N8 (released in 2010) uses the BL-4D 1200mAh Lithium-ion battery. While the device is officially described as having a fixed battery, it is actually semi-removable and can be replaced with basic tools like a Torx T4 screwdriver.

Product Specifications & Insights

* Core Specs: 3.7V, 1200mAh (4.44Wh), dimensions 45 x 35 x 5.2 mm. Alibaba Techtek-Shop

* Compatible Upgrade: The BV-4D battery (originally for Nokia 808) offers a higher capacity of 1320mAh and is physically compatible with the N8 cavity. Allaboutsymbian Alibaba

* Market Trend: As a legacy device, the market for N8 batteries is now dominated by replacement/OEM manufacturers rather than original Nokia stock. There is a steady niche demand from collectors and retro-tech enthusiasts. Tiktok Youtube

Common Issues to Watch For

* Fake Capacity: Avoid listings claiming 3030mAh or higher; these are physically impossible for the N8's battery slot and pose safety risks. Alibaba

* Fuel Gauge Compatibility: Cheap third-party batteries often lack the proper fuel gauge IC, leading to "jumping" battery percentages (e.g., dropping from 40% to 0% suddenly). Alibaba

* Swelling: Uncertified cells are prone to swelling, which can warp the N8's aluminum frame or pop the bottom end cap. Alibaba Justanswer

I have identified several sourcing options for both individual replacement units and wholesale OEM manufacturing in the files below.