The 257477BA has the following improvements to the 2577BA. The 2577BA will still be offered since it has a lower price and works in the PRC-25 and PRC-77. But the 2577BA requires removing the foam strips from the battery box.
Version 7.2This version uses a pair of 0.093" thick G10 fiberglass printed circuit boards for the plates instead of the plastic used on the standard 257477BA (Version 6.5).
The fiberglass is much stronger than the plastic used for the prior versions. Printed circuit traces replace all of the between battery connections.
Load Testing6 Sep. 2003 - Using an Electronic Load controlled by a computer a load test was run using 10 each RS 23-519 Ni-MH "D" cells rated at 4.5 AH. The battery pack lasted 30 hours with a receive load of 0.05 Amps for 9 minutes and a transmit load of 1.1 Amps for 1 minute, repeated until the voltage goes below 10 Volts. These are the loads from a PRC-25 on the 15 Volt section. This is about 4.65 AH from batteries rated for 4.5 AH and that have only had a small number of discharge - charge cycles. 11 Sep confirmed that you get 30 hours from 10 each 4.5 AH Ni-MH batteries.
Charging these batteries took 6.64 AH. It's typical that you need to put more charge into a battery than you take out of it. The efficiency of these batteries is 4.65/6.64 or about 70%.
Note that 9 AH Ni-MH batteries are available and they should last twice as long, or about 60 hours.
Power Pole OptionThe -PP option adds a pair of Anderson Power Products PP15 "Power Pole" connectors. The orientation of the Positive and Negative connectors is the one standardized by ARES. This allows this battery adapter to be used to power equipment that runs on 10 to 15 Volts DC. For more about vehicle voltages see "What's a 12 Volt battery".
I recently wanted to power a GPS receiver for 24 hours continously that needed 9 to 32 Volts and it's internal battery would only last 6 hours. So I soldered a cigarette lighter socket to one the 257477BA V7.2 Battery Adapters. This worked great.
The photo on the left is shown with the Positive connector on the left to match the way it shown on the orientation web page. Some Battery options and weights including $/Watt Hour.
Showing the 257477BA with the PPCL Cable installed. You can see that when the PPCL cable is unplugged the 257477BA can be used the same as one without the -PP option. The Red Cap on the cigarette lighter socket is to keep it clean and to keep keep out coins or other stuff that could cause a short. Note there is no fuse in the 257477BA.
The optional PP-CLS cable has a Power Pole plug on one end and a Cigarette Lighter Socket on the other end.
For those who already have one of my 2577BA or 257477BA battery adapters there are a couple of adapter cables. Note that the following two cables can be used with my adapter or with an actual battery like a BB-5598, BA-4386, or other PRC-77/PRC-25 battery to get to Power Pole or Cigarette Lighter connections.
The Optional 25-PP is a short cable with a PRC-25 Battery Plug on one end and a Power Pole connector pair on the other end. Can be used in any of the PRC-25 type battery adapters and on actual batteries like the BA-5598 or any of the mil batteries that can power a PRC-25 or PRC-77. Can also be used for charging the battery. Use the PPCL cable above to get to Cigarette Lighter socket.
Additional Data Sheet for Power Pole OptionHas table showing resistance of complete 257477BA-PP with various types of "D" cells installed. This allows predicting the putput voltage given the load current.
Operational with the following:PRC-25, PRC-74 only with the CY-6314 battery box, PRC-77, PSN-6 Loran-C receiver, TS-2963/USQ-46 (the 80718-3 1A3 battery box will only go on one way) so the USQ-42 and USQ-46 should also work.
The PRC-124 = PRC-1088 should work becasue it uses the same battery box.
PRC-1077 reported to work fine.
PRC-1099 uses the CY-2562 so will work.
RT-1185/GRA-114 Receiver-Transmitter uses the CY-2562 so will work.
Will NOT work with the following:PRC-74 with the CY-6314A/PRC-74 battery box, KY-38
Do not know about:GRC-122, GRQ-26, MSC-25, KY-65, PPS-115, PPS-115A, PPS-15B, PRD-10, PRD-11, PRD-12, URR-69, USA-32, UGC-74(), DT-561, DT-562, DT-565, MSC-25, R-2116, Tadiran PRC660T, R-2200/GRR-8, URC-100 series radios
Vehicle Power AdapterThe VPA2577 can be used to power a PRC-25 or PRC-77 by means of the front panel POWER connector. The VPA2477 has Power Pole Connectors on one end and so can be powered from the 257477BA-PP.
This is the time this page has been accessed since since 14 Sep. 2002.