On 9/8/2018 6:38 AM, Bob Spidell wrote: > 'Mains' in the UK are 240V, correct? 220-240 50hz. Most modern jump-boxes with a DC battery inside and the charging circuitry for that battery is probably smart enough to switch 120/60 vs 220/50. Need to confirm, of course. But...a transformer-based line-voltage charger likely will not have that ability. John.