Dimensions: 75 x 18 x 110 mm Not what you're after?
To maintain a constant supply of energy simply refill as the water evaporates, typically every 2 to 3 months. The H2O battery has a minimum continuous life of at least 2 years. In addition to this, the H2O battery (unlike all other conventional batteries) can be stored in its dry state indefinitely and can be left to dry out at any time during its life and its life extended indefinitely.
As all the components of the H2O battery are recyclable, the benefits over traditional batteries are countless.
Unlike conventional solar powered calculators the H2O Compact Calculator can be used in all light conditions... no more fading displays at that critical moment. The H2O batteries are easy to refill and can provide constant power for up to 3 months with just a few drops of water.
View all the eco products in our eco office
section, or click on any of the links on the left hand side to see more.
nice gadget for the office-greenie some people just don't need another tie with the wrong colour - here you have not only a useful and green gift for the presentee, but it makes a nice statement sitting on his/her table and gets conversations started (even if the functions are often not enough for the advanced use of engineers). sonja -
We offer 2 Delivery options: Standard and Express.
You'll only ever pay one delivery charge.
Standard UK delivery costs from just £3.95 per order
Express UK delivery costs from just £5.95 per order
For orders over £50, Standard UK mainland delivery is free.
The actual delivery cost depends on the size of your order, it'll be shown in the checkout when you add to basket.
We aim to deliver all UK mainland, Channel Islands & Northern Ireland packages within 3-5 working days. Please refer to our delivery page for further details including costs.
We aim to deliver all UK mainland, Channel Islands & Northern Ireland packages within 2 working days or quicker. Please refer to our delivery page for further details including costs.
How We Send Things
We send all orders by Royal Mail, or by courier if it's heavy. Royal Mail deliver Monday to Saturday, couriers deliver Monday to Friday.
Deliveries are usually made between 9am and 5.30pm. A specific time slot cannot be specified with any of our delivery options.
Please be aware that during our sales or promotions, or when there are circumstances beyond our control such as when there's snow on the roads, delivery may take longer.
European Delivery is available to selected countries.
For a full list of all countries that we ship to, and for full details regarding delivery; including delivery time and costs please click here.