I have a Bosch 12 V screwdriver drill and Bosch 12 V hammer drill
Although they are both 12V the characteristics and gearing of the two is totally different.The hammer drill version is man enough for lots of jobs and will wind the van legs up lots of times before needing a charge
I also have a Bosch 12 V tree lopper and 12 V hedge cutter and they both do agreat job.
The charger is 12minutes and with 8 batteries I can keep on drilling, cutting ,lopping and screwing all day !!!
Were I to be starting again I would go for the max voltage available without too great a weight penalty. You might as well have a mains drill (if available) than a cordless one that has batteries so heavy that you need to do weight training to use it.
------------- John
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