External Battery Roundup: Stay Away From The Wall Socket

Amstron MedXP 140 And 300

First up, we have the MedXP 140 and 300 from Amstron. These two models are the upper-end of the company's external battery line-up. There is a MedXP 66, but this wasn't available to us for testing. These are the two heaviest batteries in our roundup, and that heft is each to see in their durable construction.

The MedXP 140 is encased in aluminium with a rubber bumper. Comparatively, the behemoth-sized MedXP 300 is encased in a very thick ~1/8" shell of what seems to be ABS plastic. Both come with a full set of tips for a wide range of laptop vendors. However, only the MedXP 300 has a USB port for charging smaller devices.

These two external batteries are intended for industrial applications, particularly in the medical field. Amstron envisions its products placed on medical carts to drive mobile computers, which hospital staff can use to interact with other medical equipment.

Because of the large capacity of its batteries, Amstron provides beefy AC adapters to charge them.

Using these devices is easy. Just select the correct tip and you're good to go. The only major complaint we have is that the angled plug on the MedXP 140 makes it hard to charge without removing the output cable. The MedXP 300's charger plug is on the other side of the unit, so there is no plug conflict. Ideally, both batteries would have an off state, but this only exists on the MedXP 300.

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  • sylvain
    Interesting read. Would it be possible to do a similar test for pure USB external batteries. Used for adding that extra bit of juice to an iPad, iPhone or similar devices?
  • Anonymous

    I am interested in using the battery for a DSLR video rig, i want to use the 12v to power the camera, then split the 5v to power both an asus wicast and a SDI to HDMI down convertor. both these last two devices take a 5v feed. would this be possible do you think?
  • Spanamana
    I purchased one of these batteries from a UK supplier and have to say I have never encountered such poor customer service in a long time. They claim that they supply one free tip a year. Rubbish! When you try to get one for a iPad 3 or later, they charge you $10 because they changed the name of it from "tip".

    After 8 months the battery started not keeping its charge. I tried to use the 2 year warranty to get it replaced and found out that although the unit is guaranteed for two years, the battery is only guaranteed for 6 months. Then I was told that it would cost too much to get it repaired as there is no UK repair centre and therefore there is a charge of $30 for a replacement.

    Having delivered the replacement battery, I have not received a VAT order for £21 for import duty from TNT. So a battery that cost me £50 has now cost me £95.

    Shonky product, useless service. Don't waste your money.