Portable battery chargers

Any recommendations on emergency battery charger?

Do you mean a jump pack or plug in travel battery charger?

Jump pack

I use this one at work but it is bulky
Clore Automotive Jump-N-Carry JNC660 1700 Peak Amp 12 Volt Jump Starter https://www.amazon.com/dp/B000JFJLP6/ref=cm_sw_r_cp_tai_u6efFbFPRGDBQ

I have a friend who has one of the hand held ones and it works pretty well.

NOCO Boost Plus GB40 1000 Amp 12-Volt Ultra Safe Portable Lithium Car Battery Jump Starter Pack For Up To 6-Liter Gasoline And 3-Liter Diesel Engines https://www.amazon.com/dp/B015TKUPIC/ref=cm_sw_r_cp_tai_w7efFbMNAZNE9

Thanks. going for one of the small ones