Bosch 18v batteries and charger compatibility- I'm confused

[carpenteire2009]

Hi all, hoping someone can share some knowledge on this topic! I've been using Bosch pro 18v power tools now for a number of years and I've built up quite a collection of tools and many batteries at this stage. I've been using the original Bosch charger I got with my first cordless tool, model AL 1820 CV, to charge these batteries to date, without any issue. The batteries are all GBA 18v, various Ah, from 2 up to 6. However when charging a recent 6Ah addition to the collection, I decided to read the instructions that came with the battery and it recommends using the GAL 18 charger. Not a problem, I have a new, unused one in a tool case somewhere, but I am curious, what is the difference? The AL 1820 was good enough up to now and I've not had an issue, is there something I'm missing? Thanks in advance.

 

[okeydokey]

If you look at the labels on the chargers does one have higher amp charge rate? as that might be the recommended one for the new battery.

 

[Dabop]

The AL 1820 CV is only 2A maximum current limit, where the GAL series (depending on model number) is 4A for the GAL18-40 up to the GAL18-160 is 16A- basically the model number description is voltage followed by amps (with a zero on the end)

Using the 2A charger isn't an issue- it will just take a bit longer (won't hurt the battery pack in any way- in fact if anything its probably healthier for them in the long run (fast charging stresses the battery pack harder and does have a small (but noticeable) effect on battery service life...)

 

[carpenteire2009]

Thanks Okedokey and Dabop, all makes sense! Appreciate your rapid and helpful responses.