B3-35
This pretty expensive scientific calculator was able to charge batteries and work from the external adapter. 
Brand:
Elektronika
Calculator
Type:
Hand-held / Pocket Calculator
Series:
B3-series
Factory / Plant:
USSR microelectronics plant in Voronezh (Russia, Voronezh)
Display Type:
VFD type III (The digit assembly sandwiched between bonded glass
Power Source:
Battery-Powered, 4 x D0.26 NiCd rechargable, CR/Button/Coin/Cell-battery
External Power
Entry Method:
Algebraic Notation
Manufactured In:
U.S.S.R. (Soviet Union)
Functional Specification:
Standard Four Functions (+-*/), Sign change /-/, Square root, nth root, Reciprocal (1/x), Factorial (n!), Trigonometric, Logarithms (log), Parenthesis, Natural Logarithm (ln), Exponent (x^y), Exponential fun (e^x), Constant, Operations with Memory, Degree / Radians switch
Initial Price:
105 RUB
Circa (year):
1979..., 1981
Programmable:
Non-Programmable
Dimension (W,H,D):
NET, 79 mm (318") , 143 mm (558") , 22 mm (78")
Weight:
net, 250 g (81316 oz)