The HDa12 Baseband architecture is similar to DCT3 phones. All the ASICs are in the uBGA package. COBBA GJP, which has a serial interface to the MAD, is used. EEPROM is software emulated in the Flash-memory.
The HDa12 phone supports'ELVI' (DCT3) and 'Jeanette' (DCT4) chargers, both 2-wire and 3-wire, but when using 3-wire chargers, then the 3rd. wire (charger control input) is connected to Ground by the phone.
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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.