|Lasts about 3.5-4 hours.|
|Is larger than the 2000mAh one by a fair amount, but it is possible to fit it in with a little rearranging of components.|
Reportedly fits perfectly in the DMG battery compartment with minor modifications: pic
See the GBZ Misc Hardware page for ideas on wiring (such as JST leads).
This comes up on discord from time to time.