Anyone else have this issue? My Hana and now the DNA30 Reo with the evolv chip tell me 'weak battery' or 'check battery' sometimes. Usually it is only once, when I first fire them. It happens with both AW IMR batteries, and Samsung 25R batteries with a full charge. My charger is the xtar XP4, but before I used this charger I was using a Pila. Any idea what could be going on?