1. Can this new battery be used in the Canon EOS 5D Mark IV?
Yes, it is backward compatible.
2. Is the LP-E6NH compatible with LP-E6 chargers?
Yes, the LP-E6 chargers would work on the newer LP-E6NH. It is backwards compatible.
3. Will this be compatible with Canon 60D?
The Canon LP-E6NH Lithium-Ion Battery will adapt to the following items. Canon BG-E11 Canon BG-E13 Canon BG-E14 Canon BG-E16 Canon BG-E20 Canon BG-E21 Canon BG-E22 Canon BG-E9 Canon BG-R10 Canon EOS 5D Mark III Canon EOS 5D Mark IV Canon EOS 5D Mark IV Canon Log Canon EOS 5DS Canon EOS 5DS R Canon EOS 6D Canon EOS 6D Mark II Canon EOS 70D Canon EOS 7D Canon EOS 7D Mark II Canon EOS 80D Canon EOS 90D Canon EOS R Canon EOS R5 Canon EOS R6 Canon EOS R6 Mark II Canon EOS R7 Canon EOS Ra Canon LC-E6 Dolgin Engineering TC200 for Canon LP-E6 Dolgin Engineering TC200-i for Canon LP-E6 Dolgin Engineering TC200-i with TDM for Canon LP-E6 Dolgin Engineering TC40 for Canon LP-E6 Dolgin Engineering TC400 for Canon LP-E6 Dolgin Engineering TC400 with TDM for Canon LP-E6 Glidecam Light-Force Battery Grip for Canon Jupio BG-20 Jupio BG-C018 Jupio BG-E14 Jupio BG-E16 Jupio BG-E21 Neewer BG-1T Neewer NW-5D Nitecore UNC1 Pawa LP-E6 Charger SmallRig MagicFIZ Teradek RT MDR Vello BG-C10 Vello BG-C12 Vello BG-C14 Vello BG-C16 Vello BG-C19 Vello BG-C6 Vello BG-C8 Vello BG-C9 Watson LP-E6 Compact Charger Watson LP-E6 Duo LCD Charger Zacuto Z-AEVF Zeikos ZE-CBG5DII hahnel HC-5D MK III hahnel PROCUBE2 for Canon.
4. Will this battery work with the older cameras?
5D mk iv for example. I've got the R5 on order, but will be using the 5D iv as a backup/second body for some time.Yes.
5. Does this work with Canon R3?
The Canon LPE6NH battery does not work with the Canon EOS R3.
6. What is the weight of the Canon LP-E6NH ?
The Canon LP-E6NH Lithium-Ion Battery (7.2V, 2130mAh) weighs about 2.5 oz.