What is it?

We've all been there. That sinking feeling when you are still miles from home and look down to see that your mobile phone is almost out of juice.

Recent research by O2 found that half of us suffer from what has been dubbed FoRo (fear of running out) when it comes to battery life. This is where the Griffin Reserve Power Bank could be just the ticket.

Good points?

With charging ports for both tablets (12 watts) and smartphones (5 watts) there is ample capacity and power for most needs.

It crams in battery cells but doesn't feel bulky or overly heavy and can easily be hidden in most pockets or bags.

The unit's 18,200 milliamp lithium-ion battery is recharged via micro-USB input and takes around five hours to complete.

This should provide seven full smartphone and close to 55 smartwatch charges.

The device has a handy charge indicator system with four LEDs. You start with full illumination and as you use the bank, the lights go out one by one until you need to plug in and replenish its supply.

Bad points?

The design is a little bland. It's also on the pricey side of the power bank market.

Best for ...

Those with many devices to charge on the go as usage is simple and two gadgets can be hooked up at the same time.

Avoid if ...

You can't afford to have two power banks in rotation for when one is charging. You may be better off with a quick-charge device such as the Aukey PB-T10.

Score: 8/10.

Griffin Reserve Power Bank, £42 (griffintechnology.com)