Previous speakers have already mentioned the main features (reliable% display, long runtime, perfect fit, etc), so I only a small addition to the price. At present, the battery is listed at Amazon with about 55, which is compared to some "real" shops considerably cheaper. Both the electric-Haas in Vienna as well as the Saturn the battery whopping 79. So costs Here again clearly a point for mail order (except for the fast delivery time - 4 days from order)