Ampace JP40 All-Tab 21700 Cells Power Sharge X3 300W Power Bank: 88.8Wh Pack Enables 140W Bidirectional Fast Charging
2026-09-05 Ā· Compiled by Best IT Parts from public industry reporting
A Chongdiantou teardown confirms that Sharge's X3 300W super power bank is built on six Ampace JP40 all-tab 21700 cells wired in series into a 22.2V, 4000mAh, 88.8Wh battery pack. Each JP40 Jumbo-Power cell is rated 4.0Ah/3.7V/14.8Wh and supports 8A maximum charging, 60A continuous discharge, 198W constant output, and 140A pulse discharge for 5 seconds, with internal resistance of around 2.76mĪ©. Cell-level tests show 8A charging reaching 50% in 16 minutes and full charge in roughly 39 minutes. In the X3, this translates into sustained ~138W input (50% in 17 minutes, full in ~41 minutes), backing two high-power USB-C ports, a USB-A port, and an adjustable DC output for up to 300W total multi-port output and 140W bidirectional fast charging ā all monitored on a 1.9-inch IPS display showing per-port power, cell voltage, temperature, cycle count, and cumulative energy. The cells' expansion from power tools and drones into consumer high-power banks points to new high-rate cell options for portable energy designs.
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Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.