Charger is scratching my batteries.

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I bought at Esyb M2 portable charger and 2 HG2 batteries. They took about 5 hours to charge to full the first time and I noticed a scratch on the bottom but didn't really think much of it. Now they're charging for the second time after I ran the battery bar down to a third (I think they were at 3.6-3.8) and it's taken 4 hours for the second of three indicator lights to come on for one of them, while the other still just has 1 on.

Well, short version, I noticed the batteries are more...

Charger is scratching my batteries.

Charger is scratching my batteries.