About this replacement
Custom Battery Pack SC1700HT — 6V Ni-MH Replacement Battery
This is a 6V 1700mAh Ni-MH replacement battery pack for emergency lighting systems and backup power applications. It replaces OEM part SC1700HT in units that depend on sustained voltage delivery during power-loss events. Capacity is 1700mAh (10.2Wh) — confirmed from product data, not estimated.
- Emergency lighting compatibility: These packs share a 6V nominal rail and a standardised cell arrangement that most emergency lighting charge circuits expect. The BMS handshake on this pack aligns with charge controllers that monitor cell voltage rather than pack authentication codes.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on a 6V Ni-MH compatible charge controller. The BMS held cell balance across the full charge arc, and voltage stayed within the expected 6.0–7.2V window from trickle-in to top-off.
- First-use cycle for emergency packs: Emergency lighting units often store a pack for months before the first real event. Run one full charge-discharge cycle immediately after installation so the charge controller builds an accurate capacity baseline against the new cells.
Pack running below rated voltage on first installation
Ni-MH packs ship at storage voltage — typically 5.4–5.8V rather than the 6V nominal. Emergency lighting units that check pack voltage at startup may flag a low-battery condition or refuse to switch to standby mode. This is not a fault with the pack. Connect the unit to mains power and allow a full charge cycle before testing. After charge, resting voltage should sit at 7.0–7.2V across the pack.
Pack not reaching full charge on the first cycle
Some emergency lighting charge ICs limit current on the first cycle when they detect a pack starting from storage voltage — they treat the low initial voltage as a sign of damage and throttle the charge rate. This clears after one full cycle. If the charge indicator still shows incomplete after a second cycle, check that the charge controller's delta-V cutoff threshold matches Ni-MH chemistry — some units default to NiCd settings, which terminate charge earlier.