[jumbuck]

I dont mean the amount of current the battery can handle but if it can sustain the extra heat created by longer charge times. As a auto electrician ,I'm not an expert on lithium batterys so I'm basing my theory from exprience with other types of sealed batteries and the fact that the only thing that all expanding battery problems have in common is larger capacity. Therefore longer charge times from flat and that if you heat a sealed unit longer the more chance of expansion you will have. I'm guessing that when iriver designed the charger/adaptor they would have made it to charge the battery in the fastest time possible by using the optimal voltage-current combination. My therory is based on this not being suited to higher capacity batteries and longer charge times (and the fact that heat kills batteries). Note by expansion I mean by the build up of gas either present or formed durig charging. Dose anybody know if the batterys are vented? If the are , well that would blow my therory clean out of the water.