Acquired the batteries in October 2013. The performance in itself is fine, although I (still) can not draw any comparison to other providers. However, it is unacceptable that after 10 months have, of only five or six loading cycles already given three pieces of the mind. After consultation with the Customer is for battery only a guarantee period of six months ... so unlucky !!! As this is an internal Amazon product, also would be a "customer-friendly" management desirable. Ergo: batteries from other manufacturers to be procured, in the hope that the failure rate is low.
