So this weekend I ended up doing lengths of Britain, quite literally! This is just one of the occupational hazards for any busy session musician, and with so much traveling to do, the common way to combat the bordom is either sleeping or idevice-ing the time away. As the proud owner of an ipad 2 I chose the latter. Despite it's impressive battery stats (and the less-than-impressive battery stats of my, now very old, iphone 3GS) i was struggling for power **cue the star-trek Scottie impressions**
With this in mind i started searching for a suitable USB battery pack to have on hand for those times of amp hour need. Incidentally I always see plenty of these packs at the airports but they are always hideously overpriced. One would guess because the people that need them have usually been caught out with little charge left and have to pay the price out of desperation! After a little research and a trawl through amazon.co.uk i happened across the New Trent line of battery packs.
Contendors:
Now there are a fair few different models to go for but what wold be of most use to me was something that could charge both my apple idevices. The three New Trent devices under consideration where the IMP icruiser 11000mah, the IMP 50D 5000mah Dual-port and the IMP660 Dual-port. So the icruiser was the first I looked at and boasted the biggest fuel tank. At 1.1amp capacity I would imagine a good charge and a half being delivered to an empty ipad as well as many, many charges to an iphone. While this looked promising it had two down falls. First off it was the largest and heaviest of the bunch and more importantly it had just one single USB output (1Amp).
*For the less tech savvy, the iphone requires about a 0.5Amp socket to fast charge, an ipad requires a 2Amp output to fast charge. Hence why if you try to charge your ipad off of your iphone charger it will take forever compared to its native charger*
Next was the IMP 50D. Now this pack is only half the capacity and thus smaller/lighter than the icruiser so only offers half the charge but where this pack excels is the dual USB ports which allow you to charge two devices at once and more importantly, each output is different. One USB is rated at 500mah (0.5Amps) which is perfect for devices like the iphone and another output rated at 1Amp (like the icruser) for higher current devices like the ipad.
While all this was heading in the right direction it still wasn't quite there, and that's where the IMP660 Dual-port comes in. Holding a charge of 6600mah it was heading closer in capacity to its bigger brother (around 70% charge to a flat ipad) yet still small and light like the 50D. Most important of all are the dual outputs like the 50D, but this time one rated at 500mah and one at a higher current of 1.5Amps. This higher rated output is much closer to what the ipad needs to fast charge, happy days! If you have to tether your idevice to charge it you want it tethered for as little time as possible and that is why this pack gets the overall win for me. In an hour it will get more into the ipad than the bigger IMP will and thats what counts. It will get me 50% recharge to my ipad and a couple of charges to my 3GS before it needs plugging into the wall itself to recharge and thats more than enough to get me out of trouble. At a very reasonable £31.99 on amazon UK I dont think you can go wrong!