Sharp HE312 Z3 Replacement Battery 3.85V 2950mAh BLT M1000 The PERS-4200's charge circuit needs

The PERS-4200's charge circuit needs that window to bring the Ni-MH pack to full float — triggering a test call early can cause the unit to report low battery even with a fresh cell installed

8V per cell

and SL-20S all share the same cylindrical battery housing

so the app displays 0% or an incorrect figure immediately after install

Sharp HE312 Z3 Replacement Battery 3.85V 2950mAh BLT M1000 The PERS-4200's charge circuit needsSharp Z3 L900S FS8009 3. 85V Li Polymer Replacement Battery (HE312) This is a 3. 85V, 2950mAh lithium polymer replacement cell for the Sharp Z3, L900S, and FS8009 smartphones. It uses OEM part number HE312 and slots directly into the original battery bay. Capacity is rated at 11. 36Wh. Z3, L900S, and FS8009 compatibility: All three models share the same battery bay dimensions and voltage rail, and the BMS handshake requirements across these boards