"NiCad batteries gradually lose their maximum energy capacity if they are repeatedly partially discharged before being recharged. This is termed the memory effect. A major advantage of NiMH battery technology, apart from lack of toxicity, is the absence of any memory effect - NiMH batteries are remarkably tolerant of frequent 'top-up' charging."
Not surprisingly, the 2700s are also available on eBay for even less (incl P+P) click here.
Was looking at those 7day ones yesterday. Wonder how long they take to charge - couldn't find this info anywhere? The single reviewer at 7day didn't mention click here. Would be helpful if garrema, or someone else who buys them, will let us know & mention it in their review at 7day. G
I think you'll find the charging time is dependant on the charger. The higher the output of the charger the quicker it will charge. A charger with an output of 6v, 1000mA would take 2 hours to charge four 1.5v 2000mA batteries.