Long story short, I made the mistake of buying a solarforce P60 drop-in and now the LED has gone bad as it will not light up more than a couple lumens.(if that) I need reccomendations on P60 drop in for L2m with extended tube for 2x18650. I do not think that the solarforce drop-ins could handle 2 batteries as stated. They want me to send it back into them but shipping is more than the product costs. i would fix the p60 myself but i can’t solder worth crap.(unless someone wants to do it for me for cheap, hehe) so this is why i ask the community what drop in i should get for 2 batteries? I already have a solarforce with a sportac nichia 219 dropin and not to fond of it. my budget is around $35.
thanks in advance.
I have looked at these from Custom lite p60 dropin but i have not seen any reviews on them.
This one will take 2.7V - 8.5V
Note that while 2.7-8.5V is spec’ed, they also explicitly state “Battery Types Supported: 1 x 18650 or 2 X CR123A”. Based on that line I’d say it’s possible that it’s a linear driver. I have no other knowledge of this beyond the product listing.
Begs the question…have you checked the drop-in module outside of the light to see if indeed it is not working properly? These designs are prone to not get a good ground, that could be your issue.
If you just want a better P-60 drop-in, check out the ones from Richard (RMM) here on the forum. P-60 Drop-in
His prices are good, shipping is fast, and you can customize your emitter choice and power output with Richard. Highly recommend him.
I contacted Richard already and his drop ins are for a single cell. Thanks though.
Unfortunately I think you’ll find that this is the rule, P60’s which accept 2x18650 are the exception. I’ll be interested in seeing what people suggest!
I have no problems with Solarforce P-60 drop-ins running with multiple batteries, maybe you got a bad one. Solarforce P-60 drop-ins several do state that they are suitable for multiple 18650’s.
I would say that for running two 18650 your best bet is to order another from solarforce.
If you’re looking for a single 18650 there’s a lot of choices.
If I were in the USA I would fix that for you, 8 dollars each way for shipping kind of ruins that.
Hope you solve your problem.
I use a dummy cell in those situations, run an Efest 35A at around 6A with some modes to use when run time is more critical and let her rip! 
I’m very much the same way, juice it up, although run times on a solarforce dropin (since they aren’t driven hard) on two cells is pretty good. I use two rcr123 with one of my solarforce dropins and I get a couple of hours on high. Most recently Saturday while hurricane Arthur knocked out my power.
I have this one operating at 9V in a SolarForce host with extension. It states 18V! but it is a little outdated..