Two new things turned up today... Lithium battery for 848 (from Carbon Quest), and new kitchen scales... Therefore I couldn't help myself and had a before and after weigh-in... I'll post old and new weights later on this evening... guess away
Answer is.... 2.6 kg Old battery 3.56 (not original, swapped in last year when original died) New Lithium 0.95 kg So nearly 6 lbs in old money; not a great deal, but all adds up...
F-All...........I'm still using a cheapo Yuasa copy lead acid battery that must be at least 7 years old...charged twice and topped up twice in five years..may need charging this winter owing to lack of use.......and I suspect it has been slowly getting worse for 4 four years.......but I bet it still starts the bike fairly easily...