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Siemens SL45 - Wikipedia
Siemens v30145-k1310-x136 battery
Buy Cadex 07-110-8590 | Cadex charger battery adapter. To be used with model V30145-K1310-X136-1 Li 3.6V 550 m ah battery, made for Siemens SL45, SL45i, SL42, 6688, 6686
Even though the 5510 was revolutionary, it technically wasn't the first phone with an MP3 player. The Siemens SL45 introduced this feature almost 4 months before, in August 2001! : r/vintagemobilephones