Here’s something I’ve been playing around with for backup for my KX2. Batteries https://www.all-battery.com/tenergyli-ion1865037v2600mahrechargeablebattery-30005.aspx same folks who make the battery pack for the KX2 and for a holder/tray https://www.batteryspace.com/Battery-holder-Li-Ion-18650-Battery-Holder-3S1P-With-2.6-long-20AWG.aspx. Voltage is set at 11.1 have not tested extensivity-has built in PCB module. Waiting for my holder to come in but I’ve work with the parallel version and seems ok. The 3S1P is in series and will put out 11.1 volts (3 cells) according the Battery Space, expecting today. They also make a tray that holds 4 cells that puts out 14.8 if you need/want more power. The batteries have to be the “flat top” to work with the tray. Also for a battery charger Tenergy TLP-4000 Charger for Li-Ion/Polymer Battery Pack - Tenergy (same one used by Elecraft)
All items chosen to keep your pack light.
Update, 3S1P arrived (3 cell in series) activated PCB at full charge output at 12.52 v. No soldering, easy cell exchange, KX2 compatible, convenient external power pack when Anderson powerpoles attached. Could not be happier.
73, John-W5FLY
