{"id":715,"date":"2018-03-23T19:51:52","date_gmt":"2018-03-23T09:21:52","guid":{"rendered":"http:\/\/parablog-wordpress.dockerbox.rei.moe\/?p=715"},"modified":"2018-03-23T20:01:41","modified_gmt":"2018-03-23T09:31:41","slug":"yaesu-ft-897d-battery-project","status":"publish","type":"post","link":"https:\/\/blog.lewys.eu\/?p=715","title":{"rendered":"Yaesu FT-897D Battery Project"},"content":{"rendered":"

I decided to build a lithium battery for my Yaesu FT-897D because the official Yaesu Ni-Mh batteries are far too expensive to import here (Then you need the special charger too!)<\/p>\n

At present when operating portable, I have been running a lithium battery external to the radio (often a higher voltage battery through a little power supply)<\/p>\n

So I grabbed some battery packs made up of four 2200Mah 18650 cells each, three of these adds  up to 11.1v at 8.8Ah, this is plenty for my short trips !<\/p>\n

I planned out how to fit them inside, and there’s more than plenty of space, see image \ud83d\ude42<\/p>\n

My preliminary notes were:<\/p>\n

The three packs are each four 18650 cells in parallel<\/p>\n

Totalling up to 8.8Ah per pack at 3.7v<\/p>\n

At full charge it will be at 12.6v and at empty about 9-10v<\/p>\n

I have measured how much power the radio draws, and on monitoring it draws around 8w, on transmitting around 18w (at 10w TX power, go figure) so that\u2019s only 1-2 amps, super easy for these lithium batteries.<\/p>\n

I’m just waiting for my BMS to arrive from China (battery management system)<\/p>\n

As that has over current protection, over charge protection, over discharge protection and short circuit protection for the batteries<\/p>\n

Then I’ll use some padded sticky foam to mount them in such a way they’ll get ventilation from the existing fans and good to go!<\/p>\n

Gallery below! <\/p>\n

 <\/p>\n