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I would recommend against this to avoid any damage from over charging. Even at 2 amps the current is above the limit for a 7AH battery. I use a cheap charger purchased off ebay and have had no problem just search SLA charger. Honestly i no longer used this as i purchased a new drill but if you modify your drill you should try to use a more robust connector as i had issues where it would unplug easily.
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