LCR6V4P, LCR6V5P Panasonic 6-volt sealed VRLA battery
Replacement Panasonic LCR6V4P, LCR6V5P 6-volt battery, rechargeable valve regulated VRLA AGM rechargeable non-spillable sealed battery, needs no maintenance, low price direct from warehouse

These size battery can be found in all sorts of devices from hand held powerful torch, essential medical monitoring equipment, even children's ride on toy train.

If its going in a device that needs charging then best advice would be to charge before first use, after each and every use and if dormant for a long time then top up the charge every six weeks
Compatible replacement battery
Panasonic LCR6V4P battery
Panasonic LCR6V5P battery

Valve regulated lead acid battery (VRLA)
Absorbed glass mat technology, AGM
Not spillable
not hazardous

Chemistry of battery: sealed lead acid
Voltage: 6-volt
Capacity: 4.5Ah @20-Hr, amp hour
can replace the 4Ah and 5Ah of same dimensions

Specification table
Long - 70mm
Width - 47mm
High - 100mm
Total height including terminals - 106mm
Flat spade terminals