SOTA – 4S 8.4 Ah LiFePO4 Battery

A correspondent requested details of a lightweight high-capacity 13.2 volt battery, which I use to power my Yeasu FT-857D for SOTA activations.  The battery is a 4 cell 8.4 Ah Lithium Iron Phosphate  (4S 8.4 Ah LiFePO4)  purchased from HobbyKing’s Australian (AU) warehouse in Moruya NSW.

Battery  Dimensions: 150mm x 52mm x 70mm.  Weight: 960 grams, round up to 1 kg.

The battery is fitted with two 8 AWG leads terminated with 5.5 mm male (-ve) and female (+ve) bullet-connectors.  The 5 pin JST-XH strip connector is for balanced charging.   Rather than cut the bullet connectors off the leads, I decided to make a short DC cable adapter.  One end of the adapter is fitted with a corresponding pair of 5.5 mm bullet-connectors, at the other end I installed a pair of 30 Amp Anderson Powerpole connectors.  Why you ask?

In my shack I have standardised all DC power cable connectors to 30 Amp Anderson Powerpoles.  The same 30 Amp Powerpole connectors have been retro fitted to the DC power leads of my two SOTA/field rigs.  In doing so I have the flexibility to deploy any of my radio equipment to the field or for SOTA and not have to worry about finding matching OEM DC connectors.

With the exception of this battery, my 4S 4.2 Ah LiFePO4 plus three 2.2 Ah LiPo batteries are terminated with 30 Amp Powerpoles. Having one type of DC connector for all radio and battery power leads means I can execute a battery change without the fuss of dealing with different connectors.  Having a standard DC connector helps when I change my mind on which radio I will take on a SOTA expedition. ☺

Photos: © Copyright 2016 Andrew VK1AD

While transporting the 8.4 Ah LiFePO4 in my SOTA backpack, the battery is safely enclosed in PLANO 1450 waterproof case.

PLANO 1450 waterproof case

PLANO 1450 case

PLANO 1450 waterproof case

13.2 volt 4S 8.2 Ah LiFePO4 battery

4S 8.4 Ah LiFePO4 battery

Zippy Flightmax 4S 8.4 Ah LiFePO4 battery

Battery leads

+Ve lead 5.5 mm female bullet

Positive +ve lead terminated with a 5.5 mm female bullet connector

-Ve lead 5.5 mm male bullet

Negative -ve lead terminated with 5.5 mm male bullet connector

Homebrew DC cable adapter

DC cable adapter 5.5 mm bullet to 35 A Powerpole

Homebrew DC cable adapter – 5.5 mm bullet to a pair of 30 Amp Powerpoles

Battery is a snug fit in the PLANO Case

8.4 Ah LiFePO4 is a snug fit in the PLANO case

Safely enclosed in the PLANO 1450 Case

Battery and adapters safely enclosed in the PLANO 1450 waterproof case ready for the backpack.

Out of interest I have included a photo of the 13.2 volt 4S 4.2 Ah LiFePO4.  DC connectors are 30 Amp Powerpoles

4S 4.2 Ah LiFePO4

Zippy Flightmax 4S 4.2 Ah LiFePO4 battery

4S 4.2 Ah LiFePO4 DC connector 35 A Powerpole

4S 4.2 Ah LiFePO4 battery fitted with 30 Amp Powerpole connectors

Reference / Links

13.2 volt 4S 4.2 Ah LiFePO4 battery

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10 thoughts on “SOTA – 4S 8.4 Ah LiFePO4 Battery

  1. Pingback: More power to the activator (choosing a new LiFePO4 pack) | vk3hn

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  5. Currently running the same battery. Can’t fault it it. Runs the whole day with the KX3 on voice. Not yet tested its limits on the 706 in the digital modes.

    Chris
    VK4FR

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  7. Thanks for the expert write up on the battery Andrew. The anderson poles has really simplified the power management for us hams. What run time did you get and what power out put on the 857D? I think its better to go 42SP at 13.2 than another brand doing 12v. The 857D likes the higher voltage wheras the 817 can get by on 10v

  8. Hi Andrew yes batteries have come along way I have a new Generation 7.5 AH LIPO battery it is good for 4 days of multi Summit activation’s before you need to charge it. I have no trouble running 40-50 watts with the 857, mine is the same as the one that Compton VK2HRX purchased he got the first one and then he organized one for me yes nothing like a good battery
    regards Rod

  9. Pingback: Powering the Yaesu FT-857D for SOTA | Get out of the Radio Shack and Live Life

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