Is the battery reading 7.4v? if you've discharged it below 6v then the battery might be done for. There are possible ways to recover it but it could be dangerous and it's not recommended.
The gtb should have a lipo cut off unless it's an original one, I suggest you dig the manual out and set that on the speedo.
I've never used a lrp pulsar charger but it looks simple enough to use, just make sure it's set to charge a 2s 7.4v lipo and it's .only being charged at 1c. So if it's a 3800mah battery charge it at 3.8 amps
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