Well I made the rechargeable version of the Fluke 289 battery. 5ah is the biggest li-ion battery I could find to fit so it’s about 30% less capacity than the last version. 1 cheap board from Amazon pretty much does it all though so that’s nice.
It becomes obvious pretty quickly that you really need an indication of the charge on the battery to be useful so I made a little board to do the job.
Rechargeable 289 Pics