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The SR-51 had the same physical dimensions but added a 2nd function for most buttons. Most notable among the added functions were the ability to enter x:y pairs and do linear regression analysis on them. The later and lighter versions SR-50A and SR-51II and SR-51III were based on smaller ICs and battery packs and reached broadest distribution.
TI-30XA (2013): retained the size and shape of the 1996 model, having buttons rounded on the bottom, and the color of the "2nd" button changed from yellow to green. With introduction of a new circuit board in 2015 the logarithm bug was fixed, [4] also the calculator switched to using just one 1.5V battery instead of two.
Battery life for the primary power cells ranges from 300 hours (LR03 battery) to 200 hours (R03 battery) for continuous display of main menu. Backup cells last up to about 2 years each. The calculators weigh about 190 grams including batteries , and measure about 19.7 mm x 83 mm x 176 mm. Features include scientific calculations , including ...
Button, coin, or watch cells. A button cell, watch battery, or coin battery is a small battery made of a single electrochemical cell and shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter and 1 to 6 mm (0.039 to 0.236 in) high – resembling a button.
Mercury battery "РЦ-53М"(RTs-53M), Russian manufactured in 1989. A mercury battery (also called mercuric oxide battery, mercury cell, button cell, or Ruben-Mallory [1]) is a non-rechargeable electrochemical battery, a primary cell. Mercury batteries use a reaction between mercuric oxide and zinc electrodes in an alkaline electrolyte.
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Replacement battery packs are no longer available, leaving existing HP-35 calculators to rely on AC power, or their users to rebuild the battery packs themselves using available cells. An external battery charger was available, and the calculator could also run from the charger, with or without batteries installed.