2x Battery for Sennheiser Headphones BA150, BA151, BA152, BA 150, BA 151, BA-152 60mAh (Electronics)
Because the two batteries in the GGS. to the original Sennheiser BA151 (80mAh) are traveling only with 60mAh power, they make quite fast limp in practice, usually within 2 hours. They also go sit very tightly in the holders. Price - performance is ok