So similar in Olympus also.
Since replacement batteries had to be ordered the pack of 2 batteries and the charger has offered. Purchase and delivery as usual exemplary and quickly, the product is great.
Everything fits perfectly, the batteries are fully compatible, I present no significant difference to the performance vs.. the 3X so expensive original batteries firmly.
These bundle Star battery / charger combination inspires me. For the price of the original battery I get a second and a touring suitable charger - class.