Not much aside from the basic facts are known about the Sowjetisches Ehrenmal Kaulsdorf. When the Soviets marched into Kaulsdorf (back then a district of Lichtenberg), they buried their war dead in the local cemetery in the Bordauer Straße. The Soviets built a memorial in 1946 consisting of an Obelisk and several stone plaques with inscriptions to commemorate those who died and were buried there. The dead were moved to the Sowjetisches Ehrenmal in Treptower Park between 1947 and 1948, despite it not being officially finished until 1949.
Translation of the Russian text
It’s worth noting that the Obelisk of the Sowjetisches Ehrenmal Kaulsdorf is topped by a gold star, rather than the usual red star. Interestingly enough, this might be the only Soviet War Memorial in Berlin that only has Russian inscriptions and no German ones. The plaques at the base of the memorial are rather plain with almost no decorative engravings and contain the following Russian inscriptions :
[RU] ВЕЧНАЯ СЛАВА ВАМ БОГАТЫРИ РУССКОГО НАРОДА ОТСТОЯАВШИМ ЧЕСТЬ СВОБОДУ И НЕЗАВИСИМОСТЬ НАШЕЙ РОДИНЬ
[EN] Eternal glory to you bogatyr*, who have defended the honor, freedom and independence of our homeland
[RU] ВЕЧНАЯ СЛАВА ВАМ ГЕРОИ ОТСТОЯАВШИЕ ЧЕСТЬ СВОБОДУ И НЕЗАВИСИМОСТЬ НАШЕЙ РОДИНЬІ
[EN] Eternal glory to you heroes who defended the honor, freedom and independence of our homeland.
[RU] ВЕЧНАЯ СЛАВА ВОИНАМ КРАСНОИ АРМИИ ПАВШИМ В БОРЬБЕ ЗИ ВЗЯТИЕ г. БЕРЛИН
[EN] Eternal glory to the fighters of the Red Army, who fell in the fight for the capture of Berlin
*One of the plaques mentions БОГАТЫРИ or Bogatyr. The word Bogatyr has its origin in the Russian epic poems called Bylinas, and is used to denote a hero (though originally the word came from the Mongolian baatar) .
The Soviet War Memorial in Kaulsdorf is one of 12 Soviet War Memorials of Berlin. You can find an overview post here – The Soviet War Memorials of Berlin – with a condensed history of all Soviet War Memorials in Berlin, or you can click through the list below and read about each Soviet War Memorial individually.