[nota]

why because I have them, Li power tool batterys

used on a 12v rated El-bike
and a 24v lawnmower
batterys are ryobi 18v 4amp Li

both the bike and the mower run hot on 18v and heat the battery and wires
both came with lead acid 12v batterys [mower used 2 batterys] RATED AT 20 AMPS EACH
original lead/acid battery are DEAD and NEW replacements are HEAVY+cost
new Li batterys are costly at hundreds of $$$ each in the proper volts+amps

so I am trying to make the 18v 4 amp units I have work
would doubling the 18v Li batterys help them run cooler ?
to have 1/2 the current from each at 18v so 1/2 the draw current flow ?
will that affect the ''protection circuits'' in the power tool batterys ?

I have used the mower on 18v and the motor and wires are fine / not hot
but the batterys get hot say 140 deg f by the time they are used up
mower cuts and works ok but sometimes the battery gets so hot the thermal protection circuit cut out and I have to wait while it cools or switch batterys

the El bike I tryed last nite quickly over heated both the battery and melted my too small wires so the ride was short when I tryed the bike last nite but worked ok up to the point the battery quit [too hot]
plan is up size the wires and reduce the draw by using two batterys in parallel
to have 1/2 the current from each battery

btw the bike has a connector with one round 1/8'' post and a triangle slot also about
1/8'' anyone know where to get one to match needs a triangle post and a round hole