Any charger that will not allow normal C10 charging for the capacitys you are using is a fast charger only and in my opinion should only be used infrequently. Fast charging agine in my opinion all three of the battery technologies we normally use causes heat (sometimes to the extreme) will result at best in shortening service life. At worst it can and will cause well what happened to you.

If money is an issue tower sells 200 Mah wallworts that would work well with your 2000Mah batteries. Or there are hundreds of remarkable chargers avaliable now for cheap that are fully peak detecting and fully selectable for the normal capacity batteries we use.

The photos are my three little lovelys that are fully capable for all battery types and capacitys and even charge your lead acid (PB) flite box batterys.

The yellow ones are Prodigy Pro Peaks and magnificent units, been using them for about two years now and the other is a Mystery from Hobby City in Hong Kong for fifty bucks and it even more capable in a tiny package and came with the nice metal case and a selection of leads.

For normal flying days there is no reason to fast charge just start the evning before and heck you can even up it say another 100 mills if you like but this fast stuff makes me cringe when I see them doing that and they are always the ones that come to me and want to know whats wrong with there batteries!

Nothing but just my opinion

John