At this time of year where many of us don't get out to do any viewing for a few weeks it's worth remembering to charge up your PowerTanks/batteries every 3-4 weeks as, in common with all lead acid batteries, your PowerTank's charge needs to be kept topped up to avoid damage. I thought I'd post this reminder to avoid any disappointment when the longer dark nights come round again... Lead acid batteries lose charge even when not being used and allowing the battery to discharge power over several p