When you use AA or AAA batteries, like those in your flash, use rechargeables. But they lose 10% of their charge on day 1 and 2% each subsequent day. Worse, your batteries are NiMH so they have a “memory effect”.
- Only use conditioning chargers, like the Lacrosse. They discharge your NiMH batteries before recharging. Worth every penny.
- Use low-discharge batteries, like the Eneloop batteries. They keep their charge.
I have three of these Lacrosse chargers.