Hi Jerry,In one case all is a 100% guarantee... quick chargers reduce the life of the batteries by as much as 50% in some cases. I did that "quality fast charger vs quality slow charger" test with a fellow photographer friend of mine. His batteries lasted about 1 to 1.5 years, mine lasted a touch over 3 years before I started to see performance reductions. Our performance during that one year was identical irrespective of charger used.
Fast charging of any kind is detrimental to any battery's lifespan.
It's not the charger that I was referring to, it was battery technologies. The ones that hold a charge longer have a smaller "gas tank" and so cannot be actively used as long. The ones that give you the longest play times are the ones that if you don't recharge, are empty after a month or so of non-use and need recharging, their "gas tanks" are larger after a fresh charge.
Very good that you're so well organized. You really caught my interest about playing the audio from your Bk7m through your Fr4x, I wonder if I could do that with my FR8X?I use Eneloop 2000 mAh cells in my 4x. Get about 5 hours playing from a charge and that using the built in speakers and also playing the audio from thebk7m through the accordion speakers.
I keep three sets of batteries. One in the accordion, one for backup when playing anywhere and one on charge until charged then it becomes a second standby set. I write numbers in felt tip on each battery in each set so I don’t get them mixed up.
|S||FR-4 battery (not original) exploded while being charged in the Accordion||Digital & Midi Accordions||20|
|Battery powered BK-7m||Digital & Midi Accordions||13|
|P||Roland FR 8x battery.||Accordion Chat||3|
|Battery packs for FR-3 FR-3x FR-4x||Digital & Midi Accordions||4|
|P||AIY (Assemble It Yourself) Li-Ion battery pack for FR-5/7/7x/8x||Digital & Midi Accordions||28|