I would stick to the recommendations for that charger. It's not a charger issue, but a LiPo battery issue. LiPo batteries don't handle trickle charging very good, and if that charger was to go to some sort of trickle charge situation because you exceeded the specs, well, you could have a problem

When it comes to LiPo batteries, well, I would be very cautious. Either switch to batteries within the chargers capabilities (possible suggestion) or vice-versa.. switch chargers to match your battery requrements (recommended).

CGr