BAK B21700CB-45M Full-Tab 21700 Cell Secures GB 47372-2026 3C Certification
2026-10-27 · Compiled by Best IT Parts from public industry reporting
BAK's PRO 21700-45M cylindrical cell, introduced with a blended lithium manganese iron phosphate and high-nickel chemistry intended to pass the nail-penetration requirement of the new power-bank standard, has now obtained 3C certification to GB 47372-2026. The certificate, numbered 2026010916898753, was issued on 29 September 2026 and covers both GB 31241-2022 and GB 47372-2026.
The certified part carries the full model designation B21700CB-45M in the 21700 format. Typical capacity is 4500 mAh against a 4400 mAh rated figure, with 3.6 V nominal voltage, 15.84 Wh rated energy and a 4.20 V charge limit. The design pairs an LMFP and high-nickel blend with a full-tab electrode structure, which the supplier positions as a way to raise safety without giving up energy density or power capability.
Published figures list 250 Wh/kg energy density and internal resistance of no more than 15 mΩ, with 1C maximum charge and 3C maximum discharge. Under 25 °C and 100% depth of discharge, capacity retention stays above 70% after 500 cycles. Target applications include power banks and two-wheel electric vehicles.
For buyers sourcing replacement packs and cells, the practical signal is that 21700 cylindrical formats are now moving through the GB 47372-2026 certification path alongside pouch cells, which broadens the compliant supply base. Certification records are the reliable way to verify a specific cell, since format, chemistry and cycle life vary widely between parts that look identical on a datasheet headline.
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Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.