Psion Teklogix 7535 HU3000 Replacement Battery 7.4V 1950mAh

Psion Teklogix 7535 / 7530 G2 — 7.4V Li-ion Replacement Battery (HU3000)

This 7.4V, 1950mAh Li-ion battery replaces the original HU3000 pack in the Psion Teklogix 7535, 7535LX, and 7530 G2 mobile computers. These units are warehouse and field data-collection terminals — the battery powers the CPU, wireless radio, and scan engine simultaneously. Voltage and capacity match OEM spec exactly.

• 7535, 7535LX, and 7530 G2 compatibility: All three models share the same battery bay dimensions, 7.4V nominal voltage rail, and HU3000 connector footprint. The BMS communication protocol is identical across the group, so the same pack works without modification in any of them.
• Bench tested on actual hardware: We cycled this pack through repeated scan-trigger and 802.11b radio polling loads. The BMS held protection thresholds correctly, and voltage stayed stable under combined inrush from the scan engine and wireless module firing together.
• First-shift preparation on the 7535: After installing, seat the scanner in its cradle for a full charge cycle before putting it into active pick-and-pack rotation. The scan trigger draws its highest inrush current when the cell is near minimum — a fully charged pack prevents a false BMS trip on the very first shift.

Cradle showing a charging error after fitting a new pack

The 7535 cradle reads battery state through pogo-pin contacts on the base of the terminal. If those contacts have oxidation or debris from warehouse use, the dock sees a high-resistance connection and flags a charge fault even when the pack itself is fine. Remove the terminal, wipe the gold contacts on both the pack and the dock with a dry cloth, then reseat firmly. The error clears once contact resistance drops below the cradle's detection threshold.

Scanner losing wireless connection during rapid scan bursts

During a fast scan burst, the 7535 fires the scan engine and transmits the barcode data over Wi-Fi almost simultaneously. That combined inrush — scan laser plus radio transmit — creates a brief current spike larger than either load alone. If the battery is below roughly 20% charge, the BMS can trip the low-voltage cutoff during that spike, dropping the wireless session. Recharge the pack to full before a high-volume shift, and the combined draw stays within the BMS operating window.