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Academics are calling on schools to rethink bans on phone handsets after trials suggested that functions such as calculators, stopwatches and email can be 'educational'.
With a compact design and a three-to-one ratio of Android/i Phone charge to time exposed outside, it’s an efficient bit of kit. Voltaic 6W Charger: £118, Amazon Giving you a four-to-one ratio of smartphone charge to time spent in the sun (or one-to-one for tablets), this is a very effective, lightweight gadget that’s ideal for hikers.One full charge, taking five hours via USB mains or 25 hours of UV rays, gives enough for around three smartphone charges. Little Sun Charge: £79.64, Celery The ultra-portable Little Sun Charge was a crowd-funded idea which came to fruition last year.With its medium output (12.5Wh), it's about the size of a DVD case.The smartphones also allowed pupils to access revision websites, log into the school email system, or transfer electronic files between school and home.The study by researchers at Nottingham University involved 331 pupils in schools in Cambridgeshire, West Berkshire and Nottingham.It’s also waterproof and urethane coated for an extra layer of protection. About the size of a magazine, simply clip the charger on to your backpack while on the move. Freeloader Supercharger: £49.99, Solar Technology About the size and weight of an i Pad, this is a rubber-cased, waterproof solar charger built for impact so there are no worries if you drop it.
With a zip-up compartment to keep your on-charge devices in, the design’s well thought out. It takes an average of three hours to charge an i Phone, which is an average speed on this list.
It’s a pocket-sized dual power bank and solar charger.
We'd recommend charging via USB and using solar as a secondary method with this one.
The most straightforward way to compare them is a ratio of power to smartphone battery life, or Wh output.
Around 10Wh is sufficient for a slower charge (for example, 12 watts takes one hour and 50 minutes to charge an i Phone 6), while 100-200Wh is a super-quick power-up.
Compatible with all devices that charge via USB and including an LCD battery monitor, this is a versatile mid-priced option for when you need charge immediately. Waterproof 15W Solar Charger: £44.95, Mobile Solar Chargers This waterproof, laptop-sized solar charger unfolds to over twice the size, at a similar weight to the average satchel.