It is a pity I did not see these comments sooner. I would just like to share my experience as well which will confirm the statement made re the bad quality of the Omnipower batteries. I have had my 5KVA Inverter for 4 years and after 3 years had the replace my 4x100a/h batteries. Replaced by 4x120a/h Omnipower batteries. More expensive than the first set I had. After 1 year, exactly one week before end of the year, the batteries would not last 1 hour during load shedding. In the past we would enjoy at least stage 2 with the 4 and half hours load shedding. Had these batteries checked in at Sinetech via Communica. After following up with Sinetech numerous times, they came back after 3 weeks saying that there was nothing wrong with the batteries. I collected the batteries from them . Had the Inverter checked out by Mustek and there report also showed no default on Inverter. Had batteries checked out by an electrical expert and his report showed that batteries were at fault. Did not hold the voltage. This report was printed and forwarded to Sinetech. It was followed up a week later with a second email to Sinetech, again with no response. This just conforms the previous comments on this Forum that the quality of the Omnipower batteries is not up to standard and want to add that the backup support is also non existent.