4 x AA eneloops on TK40 on turbo

headophile · Oct 18, 2009

as the title states, will the batteries be able to handle it?

if so, how long is the runtime?

if not, will the high-current aa batteries used in mag85s (like titanium power max or cbp elite series) be safely applicable in this situation?

i'd really like to run the TK40 in 4 x aa configuration.

thanks!

headophile · Oct 18, 2009

any knowledgeable enough people care to reply?

even theoretical answers with exact amperage figures (and other things i'm probably failing to consider at this point) would suffice.

also, i won't hold you liable if something goes horribly wrong

ubetit · Oct 18, 2009

The batteries in the TK 40 are 4x4 in a series-parallel setup. The extra 4 batteries just increase runtime. All the rules that apply with 8 cells should apply with 4 cells with less runtime. I used Turbo fo 25 minutes the other night while cleaning out a dryer duct outside and it never overheated. I run eneloops. Not sure i'd use alkalines in this way though.

headophile · Oct 18, 2009

thanks for the reply and that's great to know!

i was just reading the tk40 manual and fenix doesn't recommend using turbo on 4 x aa. i guess that only applies to alkaline primaries then.

how long would be the total runtime on turbo? has your light died yet?

headophile · Oct 19, 2009

any more inputs regarding this configuration? anyone?

LEDninja · Oct 19, 2009

The TK40 requires ~3A.

Some batteries cannot produce 3A.

The Eneloop can.

The Eneloop produce 2AH. The TK40 requires 3A. 2AH/3A=2/3H=40 minutes. YMMV.

headophile · Oct 19, 2009

^

info is perfect and silenced all my concerns. thanks a lot! :twothumbs

looking forward to getting this light at the end of the month :grin2:

4 x AA eneloops on TK40 on turbo

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