Just £1.40 for 5 C cases including free delivery
Christmas is coming and the kids need more batteries. AA rechargeable batteries are cheap, but C's are much more expensive, and many chargers will not support them. The solution is to use AA to C convertors. As both battery types run at the same voltages there is absolutely no harm in using AA's to power C appliances. Modern AA's can also come very close the capacity level of C batteries.
*AA's are much cheaper (£7 for 4x decent Low Self Discharge Eneloop rechargeables vs £30 for similar C's)
*AA's are more common. They can be used in many appliances and it is easy to store a few spares.
*Smaller chargers, (travel and USB) can be used.
*Low Self Discharge AA's are much easier to find. Sanyo Eneloop, GP Recyko, Duracell Active Charge and many more are available to choose from.
I have used similar items along with Eneloop and Recyko Low Self Discharge AA's to power radios, kids toys and even my torch.
The only downside I can see are that they come in packs of 5. If you have an appliance that requires 6 cells you need to order two packs.
edit: mikezs pointed out that DealExtreme also sell D converters that take 2xAA cells for around £1.50. Link below.http://www.dealextreme.com/details.dx/sku.22082