Battery Green Cell DE77ULTRA for DELL Inspiron 15 5551 5552 5558 5559 17 5755

Green Cell DE77ULTRA is a replacement battery for Dell Inspiron 15 (models 5551, 5552, 5558, 5559) and Inspiron 17 (model 5755). Built from high-density Panasonic cells and advanced electronics, this Li‑Ion battery provides reliable power for everyday use and is intended as a direct substitute for worn or failing original batteries.

Advantages

The Green Cell ULTRA battery uses Panasonic cells that deliver higher energy density and improved durability compared with many original cells. Integrated electronics enhance operational stability, efficiency, and safety. The design aims to provide up to 50% longer runtime under comparable conditions, and the 3400 mAh Li‑Ion chemistry supports consistent performance during typical office, study, and multimedia tasks.

Suitable for

• Dell Inspiron 15 5551, 5552, 5558, 5559
• Dell Inspiron 17 5755
• Replacing old or degraded laptop batteries

Key specifications

• Model: DE77ULTRA
• Battery technology: Lithium‑Ion (Li‑Ion)
• Capacity: 3400 mAh
• Colour: Black
• Compatible brand: Dell (Inspiron 15 / 17 series specified above)
• MPN: DE77ULTRA
• EAN: 5903317221067

How to use

Turn off the laptop and disconnect it from the power adapter. Remove the bottom cover according to the Dell service instructions, extract the old battery, and install the Green Cell DE77ULTRA in the same orientation. Reassemble the laptop, connect the charger, and allow the battery to charge fully before normal use. Follow Dell’s guidelines for safe battery removal and installation to avoid damage.

Recommendations

For longest service life, calibrate the new battery by charging it to 100% and then discharging to around 5–10% once or twice in the first few cycles. Avoid exposing the battery to high temperatures and store it at about 40–60% charge if unused for extended periods.