Estry 55111-05 6.0V 700mAh standard battery

Direct replacement battery

The Estry 55111-05 is a 6.0V 700mAh nickel-metal hydride pack built to match the original specifications for the 5800RP Wireless Repeater and K0257 devices. It delivers 4.2Wh of energy in a compact 51.5 x 45.2 x 10.9mm form factor weighing 85.0g. The pack includes overcharge, over-discharge, over-voltage and short-circuit protection for safe operation. Certifications include ISO9001, RoHS, CE, UN38.3 and MSDS.

Upgrades worn original cells

This pack replaces the factory-fitted battery when runtime has dropped or the repeater no longer holds a charge through its duty cycle. The jump is worth it when the existing cell shows reduced capacity, swelling or failure to power the 5800RP Wireless Repeater reliably. Matching the original voltage and 700mAh rating restores the intended operating time without modification. Confirm the part number 55111-05 or K0257 before ordering to ensure correct fit.

Suits repeater owners needing a certified spare

The battery suits technicians and installers maintaining 5800RP Wireless Repeater units who require a RoHS-compliant, CE-marked replacement with documented safety testing. It is not for buyers who need a different voltage, a higher capacity than 700mAh, or a chemistry other than nickel-metal hydride. The fixed 6.0V output and specific dimensions also rule out use in devices expecting other form factors or electrical parameters.