All in all looks good to me good location also it looks well built i dont think a 4 digit matters ? good job on the jumper cable ,you put the cable connection at the end of the coil cable at the cut ? sort of a quick coil change connection it,s a good start small refinments is all that is needed like you said rechargable

Jim
Sovereign GT 1 Carbon Fiber shaft,s chest mounted , Rons 180 meter .
Coils Tornado 10" & 8", SR S-12 ,Minelab Coinsearch 8" , SEF 12x10, Custom made Skullies OBN. Pro Pointer, SR S-1 search probe , Stealth 720-i
Bling 2013 - Rings Gold 2 - Silver 1
Now life it,s slow n low

Retired 04-12-2011