I am new to this forum, so please bear with me if my questions seem rather naive.
This topic has been addressed in past years on this topic, but I believe current technological advances and price adjustments might affect previous responses.
I recently obtained some old school lantern battery powered flashlights with red flasher requiring a square top 6 volt lantern battery with spring terminals (908) and am having trouble determining which battery would best suit my needs. I will probably be using these flashlights infrequently as emergency lighting and on camping trips. I am looking for cost effective and inexpensive power. My first thought was to use rechargeable sealed lead-acid batteries rather than than using stock alkaline units. Even though they would require ongoing maintenance, I thought they would provide a better value considering their extended life. Now I am considering using a lantern adapter unit requiring 4 D cells but have no idea what type cells would be best suited (alkaline?, rechargeable NiCd?, NiMH?, Li-ion?). Further confusing are all the videos on YouTube showing the contents of various brands of lantern batteries as 4 "F" cells, 4 to 6 "D" cells, or 32 "AA" cells! (I'm wondering if I can modify the adapter to accept rechargeable F cells). I am now frozen with indecision. I need 3 lantern batteries total. I am not looking for the brightest light, longest lasting, or most inexpensive, but a good balance overall. Weight is not an issue.
As I see it, my options are:
Heavy Duty Lantern battery - $5 local
Alkaline Lantern battery - $8 local
4D-to-Lantern adapter - $6 eBay
Rechargeable NiCd D battery - $4 ea. local (approx.)
Rechargeable NiMH D battery - $5 ea. local (approx.)
Rechargeable Li-ion D battery - is this even available for this application? They seem kind of rare.
Rechargeable SLA Lantern battery - 6 V 4.5Ah or 5Ah - $15-$20 eBay
Plus whatever other ideas you may think of.
Any quality differences between the SLA brands? Anyone I should NOT buy? Some are quite critical of their competition.
Interstate's Power Patrol SLA0916
Power Star DE650-S (PS50-6T) PS6-5ST
Universal Power Group UB650F (D5897) Universal Power Group D5697
Douglas Guardian: DG6-4
Universal Battery: UB5-6S (D5697)
Kung Long WP66S
Moultrie Feeders MFHRB6
Technacell EP64021, TC640, TC64021
Universal Battery UB650S
Any assistance will be appreciated.