BP-1A Battery Pack for SR-50 SR-50A SR-51 SR-51A SR-56 SR-52 TI-58 TI-58C TI-59

Description

This listing is for a BP-1A battery pack for Texas Instruments calculators SR-50, SR-50A, SR-51, SR-51A, SR-56, SR-52, TI-58, TI-58C and TI-59.  This is an original TI pack that has been rebuilt with 3 Tenergy 1000 mAh NiCad AA batteries.  The BP-1A was originally built with NiCad batteries and this will keep it close to its original design.  The housing is in excellent condition without any chips and cracks.  The latch is in perfect condition and will lock into your calculator perfectly.  The two battery terminals are in excellent condition and will make good contact.  This pack was charged for 5 hours in an SR-50A and then tested with all segments lit (10 mantissa digits of 8's with sign and 2 exponent of 8's with sign) and was able to run for 4 hours and 30 minutes continuously before needing a recharge.  Obviously this is worst case and it should be able to run for much longer during normal use.  All pictures are of the actual BP-1A battery pack you will receive.  Ships via USPS first class with tracking.