Nintendo DS Lite NTR-003 Replacement Battery 3.7V 850mAh

Nintendo DS Lite / DS Phat — 3.7V Li-ion Replacement Battery (NTR-003)

This 3.7V, 850mAh Li-ion cell replaces the original battery in the Nintendo DS and DS Lite handheld consoles. It also fits AGS-101 and AGS-003 Game Boy Advance SP models that share the same footprint and connector. Dimensions are 56.07 × 31.17 × 6.21mm — a direct physical match for the battery bay on all listed models.

• Cross-platform fit — DS, DS Lite, and GBA SP: The NTR-003, NTR-001, BT-M12, and BAT-GBASP-1LI part numbers all share the same connector pin-out, cell voltage, and physical envelope. Nintendo used this battery family across multiple handheld revisions, so one cell covers the full listed range without modification.
• Bench tested on actual hardware: We seated this cell in a DS Lite and cycled it through the onboard charge circuit. The charge IC accepted the cell at full rate, the BMS reported no fault codes, and the power rail held stable through the dual-screen startup sequence.
• Fuel gauge calibration after install: After fitting this cell, run a full play session from 100% until the console shuts itself off automatically — do not interrupt it. The DS fuel gauge IC sets its empty reference point against the first complete discharge. Skipping this step causes the battery indicator to jump or read low early for the first several sessions.

Why the DS Lite fuel gauge reads empty before the console actually dies

The DS Lite uses a simple voltage-tracking fuel gauge — it maps remaining charge to a voltage curve programmed for the original cell. A replacement cell with a slightly different internal resistance will shift that voltage curve, so the gauge hits its low-voltage threshold before the cell is genuinely depleted. This is not a fault in the replacement battery. Running three to five full discharge-to-shutoff cycles lets the console's charge IC re-anchor its reference points to the new cell's actual curve.

Console powers on but shuts off seconds later after swap

A replacement cell shipped at storage charge — typically around 3.5V — can sit just above the DS's low-voltage cutoff threshold. The console boots, draws current for backlight and dual-screen init, and the voltage sags below the cutoff before the main menu loads. This is not a dead cell. Connect the charger and let the console charge to at least 3.7V before powering on again. If the charge LED does not light, reseat the battery connector — the DS Lite's contact spring loses tension after repeated swaps and may not be making full contact.