Globalstar GSP-1700 Replacement Battery 3.7V 2600mAh Li-ion

Globalstar GSP-1700 — 3.7V Li-ion Replacement Battery (GPB-1700)

This is a 3.7V, 2600mAh Li-ion battery for the Globalstar GSP-1700 satellite phone. It replaces OEM part GPB-1700 and fits the GSP-1700 directly. The GSP-1700 is a portable satellite communicator used for calls, messaging, and emergency alerts in areas with no cellular coverage.

• GSP-1700 platform fit: The GPB-1700 form factor is specific to the GSP-1700 housing. The connector pinout carries the BMS data line the phone uses to read state-of-charge — wrong pack geometry or missing data pin causes the phone to reject the battery at boot.
• Bench tested on actual hardware: We cycled this pack through satellite acquisition sequences, which draw a sharp current spike as the antenna deploys and the radio locks onto a bird. The BMS held the voltage rail steady through repeated acquisition attempts without tripping into protection mode.
• Cold-weather field use: In sub-zero conditions, keep this battery in an inner chest pocket until just before use. Li-ion internal resistance rises sharply below 0°C, and the acquisition current spike is large enough to trip the BMS on a cold cell — the phone will shut down before it ever registers a signal.

Why the GSP-1700 shuts down during satellite acquisition

Satellite acquisition is the single highest-draw event the GSP-1700 performs. The antenna mechanism, the L-band radio, and the search algorithm all draw current simultaneously. On a depleted or degraded cell, this combined load pulls voltage below the BMS cutoff threshold — typically around 3.0V — and the phone cuts power before the call connects. A fresh, fully charged cell maintains enough voltage headroom to absorb that spike. If shutdowns happen consistently at the acquisition stage rather than mid-call, the battery is the first thing to replace.

Charger won't accept the GSP-1700 pack after extended storage

Li-ion cells self-discharge slowly in storage. If the pack sits unused long enough, the cell voltage drops below the charger's acceptance threshold — typically around 2.5V — and the charger reads the pack as faulty and refuses to start a charge cycle. This is a protection circuit behaviour, not permanent cell damage. Many OEM Globalstar chargers include a recovery or trickle-charge mode; plug in the pack and leave it for 30–60 minutes before the charger shifts to normal charge. If the charger has no recovery mode, a universal Li-ion charger with a boost or manual start function can bring the cell back up to 2.9–3.0V, at which point the standard charger will accept it.