Performance Varies Greatly
I own 7 of these ERDVDMAX battery packs. I decided to test them for longevity by running each from a full charge to complete drainage, using them to run my 9 inch Philips DVD player. I tested each battery twice, so there were 14 test runs. Results:<br /><br />First Charge: Worst: 204 min. Best: 580 min. Average: 330 min. (5 H 30 M)<br />Second Charge: Worst: 291 min. Best: 674 min. Average: 474 min (7 H 54 M)<br /><br />All batteries showed improvement on the second charge. But performance varied enormously from one battery to the next. I can see why some reviewers gave this product one star; they received under performers.<br /><br />I bought 6 of my ERDVDMAX when someone on E-Bay was selling them for $20 each, which I still consider a pretty good deal (but no longer available).<br /><br />Prices on Amazon change daily. But as I write now, this item costs $39.15 (incl. shipping). Not such a great deal. Also as I write, you can get the Lenmar DVDU923 battery pack for $40.94 (free shipping) which is smaller, lighter, more powerful, and more consistent. To date, 8 test runs on my 4 Lenmars average out to 565 min (9 H 25 M). The worst performance was 428 min; the best 630 min.<br /><br />[[ASIN:B0011MZORU Lenmar DVDU923 Universal Li-Ion Battery for Select Portable DVD Players]]
Rating: 4 stars