Top critical review
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Download user manual before buying
on 25 June 2011
Update: After I wrote the following review, the description of this item has been changed to reflect that this charger should be used with conventional (old style) lead acid batteries.
The unit is quite heavy when considering the size. Usually this means that it has got some large transformers, which is a plus.
Jumpstart: This function works reasonably well (has to be connected to mains) on both conventional and maintenance free batteries.
Charging: One thing worth noting though is that this charger is meant for use with the older type refillable batteries, so if you have one of those "maintenance free" batteries it will damage it, as happened in my case. The reason for this is the charge current delivered to the battery whilst charging. Given that the unit delivers quite a large current, the acid in the battery will vaporize during the charge cycle. Normally one would then top up the battery with distilled water, yet this cannot be done on maintenance free batteries due to the fact that they do not have removable caps. This will result in loss of acid, and eventually render the battery useless.
The user manual "strongly advises" you to use Draper Automatic Charger BC8A (http://www.amazon.co.uk/Draper-66800-12-Volt-Automatic-Battery/dp/B0001K9ZYG/ref=cm_cr-mr-title) for use with maintenance free batteries. I do think that it should be written on the charger itself.
You can download the manual from the link provided in the comments below. Page 9 refers to maintenance free batteries.
Hope you will find the review useful for buying a charger.