On Wednesday, December 31, 2014 8:38:42 PM UTC-8, shkdriver wrote:
Has anyone adopted the K2 brand lithium as a ship battery?
Praise or Problems? the reduced weight appeals to me.
Scott.

I used the K2 LiFePO4 batteries (with BMS) all last year. I also used a battery tester to put them through their paces prior to flying with them. They last about 15-20% longer than my larger and heavier 10.5 Ah SLA batteries and have a much, much flatter voltage profile during discharge. This means they go even longer before you get battery warnings (that is mostly a good thing - though the time from first warning to flat is 15 minutes or less). The flatter, higher voltage profile also makes it a lot easier to slave two batteries together through a pair of Shottky power diodes because the diode voltage drop doesn't reduce useful battery life nearly as much as with SLA.

Nothing but good things to say about them. They are expensive, but worth it to me.

9B